Ethan Brooks leads Sales and Partnerships at PeakIntent, where he helps high-ticket service businesses, from personal injury and tax resolution firms to cosmetic surgery, dental, restoration, and roofing companies, buy exclusive leads that actually convert. He writes about lead economics, why cost per signed case beats cost per lead, and how to scale acquisition without wasting budget.
If you run a plaintiff PI firm at any size, solo, mid-tier regional, or the multi-state, you’ve probably done the math on shared-lead networks and concluded the per-lead price looks cheap. Then you watched signed-case rates not move and quietly redirected spend to something else.
This is the post about why that happens, with numbers from the actual primary sources instead of vendor pitch decks. The short version: cost-per-lead is the wrong metric. Cost-per-signed-case flips the comparison hard. And the gap is structural, driven by speed-to-contact dynamics that shared networks can’t fix by lowering price.
The number every PI lead-buyer needs to internalize: 100x
The most-cited number in inbound-lead conversion comes from Dr. James Oldroyd’s study at MIT Sloan, which analyzed 15,000+ leads across 100+ companies. The brutal finding:
Contacting a lead within 5 minutes vs. 30 minutes increases your odds of actually reaching them by 100x and your odds of qualifying them by 21x.
That’s not a marketing claim. That’s the underlying behavioral data behind every “speed-to-lead” tool ever sold. Most people quote it as a 5-vs-30 minute spread; the curve drops steeply inside that window.
Then the question is: how fast are PI firms actually responding?
Hennessey Digital’s 2024 mystery-shopper study tested ~1,400 law firms. Findings:
- Median response time: 13 minutes (an improvement from 20 minutes in 2023)
- 27% of firms NEVER respond, the lead form submission disappears into the void
- 29% take more than 30 minutes, outside the 100x window entirely
- Car-accident vertical specifically: median 19 minutes (2021 study)
And Clio’s 2024 Legal Trends Report ran a parallel test on 500 firms, only 33% replied to email (down from 40% in 2019), only 40% answered the phone (down from 56%), and only 18% gave clear next steps.
(For the operational playbook on hitting that 5-minute window, staffing, queue routing, and the SLA dashboards that surface slippage, see our 5-minute speed-to-lead playbook for service businesses.)
So the baseline is: most firms are losing inbound leads to slow follow-up. Now layer the shared-network dynamic on top.
What shared-lead networks actually do
The category includes Martindale-Nolo’s shared tier, LegalMatch, 4LegalLeads, and the long tail of smaller affiliate-style networks. They differ on details but share a structural pattern.
Martindale-Nolo explains its own model publicly: they sell BOTH shared leads (the same inquiry sent to multiple attorneys at lower cost) AND exclusive leads (“LeadDirect,” priced higher, one attorney). Their own product team admits this. It’s the cleanest public confirmation of the shared-network economic model.
How many attorneys see a single shared lead in practice? No platform publishes a guaranteed number; industry write-ups from InjuryLeadGen and Rankings.io cluster the typical answer at 3-5 competing attorneys per shared lead.
When a consumer submits a form on a shared network, three to five PI firms get notified within seconds. The first to make contact wins the conversation. The remaining two to four are calling someone who’s already on the phone with another lawyer or has decided which firm to talk to first.
That’s the structural problem. It has nothing to do with the price you pay per lead. It exists at $50/lead, it exists at $300/lead.
The cost-per-signed-case math flips the comparison
Per-lead pricing is the metric vendors highlight because it favors shared. Cost-per-signed-case is the metric that matters to your firm’s P&L, and it tells the opposite story.
The math, using midpoint ranges from InjuryLeadGen’s 2026 pricing guide and industry-typical close rates from LEXGRO benchmarks:
Shared lead path: - $200 per lead (midpoint of $50-$350 range) - ~3% lead-to-signed-case (you’re often arriving 5th and the case is already retained) - Cost per signed case: $6,667
Exclusive lead path: - $400 per lead (midpoint of $150-$700 range) - ~12% lead-to-signed-case (no race; the speed-to-contact math works for you) - Cost per signed case: $3,333
Exclusive is 2x more expensive per lead and roughly half the cost per signed case. The MIT speed-to-contact data is exactly what powers that flip, when you’re the only attorney with the inquiry, your 30-minute response is still inside the 100x window. When you’re the fifth, your 5-minute response is competing against another lawyer’s 90-second response.
Two things to keep in mind on these numbers:
Close rates vary widely. Clio’s 2024 data implies ~7-8% average across all firms. Industry targets for actively competing PI firms are 15-35% on lead-to-retainer overall; the top firms hit 40-50%. The 3% on shared and 12% on exclusive assumed above are midpoint estimates, your actual numbers will sit on the curve based on your intake-team conversion infrastructure.
Case value matters. The Insurance Information Institute reports average auto bodily-injury claims at $24,211 (2022 data). A signed MVA case with a typical 33% contingency = ~$8,000 in fees. Compare that to your cost-per-signed-case and the picture is clear: shared leads at $6,667/case eat ~83% of fee margin before any work is done.
The bar-association angle people forget about
State bar advertising rules govern what “lead-gen networks” can and cannot do, and the rules have real teeth. Florida Bar Rule 4-7.22 defines “qualifying providers”, lawyer referral services, matching services, directories, pooled-advertising services, and requires participating attorneys to verify the provider complies before sending fees.
Translation: if a vendor doesn’t pass the Rule 4-7.22 screen, your participation creates direct exposure. Most marketing decisions don’t carry that kind of downside; lead-vendor selection does. Worth a 10-minute conversation with your bar-compliance counsel before signing any new vendor in Florida specifically, and the same logic exists in other state-bar regimes (California’s RPC 7.2, Texas 7.04, New York DR 2-103).
When shared lead networks actually do make sense
Being honest: shared isn’t always wrong. Three legitimate use cases.
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A new market entry where you don’t have brand awareness or organic inbound yet, and any contact volume is better than zero while you build the funnel. Shared is volume at lower commitment.
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A specific case-type test before committing exclusive spend. Run a 60-90 day shared experiment to learn what claim profile actually retains in your market before paying for exclusive flow.
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An after-hours backstop where shared leads supplement your intake team’s bandwidth during low-conversion windows (overnight, weekends) and a sub-optimal close rate is better than zero capacity.
In all three the rule is: shared as bridge, not as primary channel.
Before signing with any new vendor, shared or exclusive, our 7-point lead generation vendor evaluation checklist walks through the diligence questions that surface the structural problems before you commit budget.
Where exclusive wins
If you have intake capacity that can convert at 15%+, exclusive economics win. The math compounds three ways:
- No race-to-first-contact means your existing intake-time is competitive even when slightly slower than industry-best.
- Better signed-case profile because consumers who fill an exclusive provider’s form are typically further along the intent curve (they’ve already had the brand-recognition moment that gets them past the “shop around” instinct).
- No bar-compliance exposure when the provider isn’t operating in the qualifying-provider gray zone.
The firms that have scaled past $50M revenue almost universally moved their primary acquisition spend off shared networks years ago. Mike Morse Law Firm went from $17M to $160M annual revenue under Mike Morse + COO John Nachazel, there’s a reason intake-velocity + exclusive-flow appears in every interview they’ve given. Morgan & Morgan spent $218M on legal-services advertising in 2024 (≈8% of all US legal-services ad spend that year per ATRA), and almost none of it goes through shared-lead aggregators. They built direct demand because the math demands it at their scale.
What to do with this
If you’re running a PI firm that’s been on shared-lead networks more than 6 months and revenue isn’t compounding from that channel, three useful pulls:
1. Run cost-per-signed-case on your last 12 months of lead-vendor invoices. Not cost-per-lead. The shared/exclusive flip happens at this number, not the per-lead number. 2. Time your intake-team’s actual median response. Hennessey says 13 minutes for the industry; the MIT curve says you need 5 to hit the 100x window. Wherever your number sits, that’s your honest position on the conversion curve.
3. Pick ONE case-type and pilot exclusive flow against shared for 60 days. Measure cost-per-signed-case, not CPL. The math should answer itself.
We run exclusive lead generation programs for plaintiff PI and broader legal firms at PeakIntent, one inquiry, one buyer, no race. If your firm’s at the point where the cost-per-signed-case math is the question and you want to model it against your actual signed-case rate + market mix, book 10 minutes and we’ll pull your numbers. Or email, [email protected].
Ethan Brooks runs Sales & Partnerships at PeakIntent.
Sources
- Oldroyd / MIT Sloan, The Short Life of Online Sales Leads (InsideSales-funded study, 2004-2007)
- ATRA, Legal Services Advertising Report 2017-2024
- Hennessey Digital, 2024 Law Firm Responsiveness Study + 2021 study
- Clio, 2024 Legal Trends Report
- Insurance Information Institute, Facts + Statistics: Auto Insurance
- Florida Bar, 2025 Handbook on Lawyer Advertising + Solicitation (Rule 4-7.22)
- Martindale-Avvo, How Martindale-Nolo Delivers Leads
- InjuryLeadGen, Exclusive vs Shared Leads + 2026 PI Lead Pricing Guide
- Rankings.io, Personal Injury Lead Costs + Mike Morse interview
- LEXGRO, Law Firm Conversion Benchmarks + 2026 Marketing Spend benchmark