PI marketing directors ask some version of this question constantly: which lead generation vendors are actually worth the money? The honest answer is that it depends entirely on your firm — your practice areas, your intake process, your markets, and your cost per case benchmarks. A vendor who performs well for a mass tort firm in Texas may underperform for an auto accident firm in Florida.
That's why rather than hand you a ranked list, this article gives you something more durable: a grading framework for evaluating any vendor in any market. Apply it consistently and you'll know — with your own data — which vendors belong in your portfolio, which need a performance conversation, and which are costing you money you won't recover.
Related guide: See our complete guide to evaluating PI lead vendors — the 7 metrics that define vendor quality and how to build a vendor scorecard.
Why Vendor Rankings Don't Work
Any article that claims to tell you definitively which PI lead vendors are “the best” is either selling you something or working with incomplete information. Here's why:
- Vendor performance varies dramatically by geography — a vendor dominating auto accident lead gen in Phoenix may have weak inventory in Atlanta.
- Performance depends on your intake speed and staffing — a firm with a 2-minute response time will get dramatically better results from the same vendor than a firm with a 4-hour response time.
- Case type matters — vendors who excel at soft-tissue auto cases may be weak on trucking or premises liability.
- Quality drifts over time — a vendor's lead quality in 2023 says very little about their quality today.
What you need is a grading system that uses your data, measured consistently, over a long enough window to separate noise from signal.
The Four-Dimension Vendor Grading Framework
Grade every vendor across four dimensions. Together they produce a composite score that reflects actual value — not just cost, and not just volume.
Dimension 1: Conversion Rate
Conversion rate measures how many of a vendor's leads become signed cases. Calculate it as signed cases divided by total leads delivered, expressed as a percentage.
How to grade it:Establish your firm's baseline conversion rate across all vendors — this is your benchmark. A vendor converting at 1.5x your baseline is performing well. A vendor converting at 0.6x your baseline needs a conversation. Track this monthly per vendor and watch the trend, not just the number. A vendor whose conversion rate is declining over three consecutive months is a warning sign, even if the rate is still above your baseline.
Common trap:Don't evaluate conversion rate without controlling for intake speed. If your team takes four hours to respond to leads from Vendor A and fifteen minutes to respond to leads from Vendor B, the comparison is meaningless. Standardize your response time across vendors before drawing conclusions.
Dimension 2: Cost Per Signed Case
Cost per case is the financial outcome of conversion rate. It accounts for both what you paid per lead and how many of those leads became signed cases.
Calculate it: total spend with a vendor over a period, divided by signed cases attributed to that vendor during the same period. Use a 90-day rolling window as your standard — shorter windows introduce too much noise.
How to grade it:Set a maximum acceptable cost per case for each case type your firm handles. Auto accidents may have a different ceiling than trucking cases. Grade vendors against those ceilings, not against each other. A vendor with a high absolute cost per case may still be within target if the cases they deliver are high-severity. That's why cost per case should always be read alongside case severity.
The vendor conversation:When a vendor's cost per case exceeds your ceiling, this number is what you bring to the renegotiation. It is objective, defensible, and directly tied to your business outcome. “Your cost per lead has increased 20% and our conversion rate on your leads has dropped from 11% to 7%, putting our cost per signed case at $3,200 against a ceiling of $2,500” is a conversation. “We feel like lead quality has been slipping” is not.
Dimension 3: Case Severity
Case severity measures whether the cases a vendor produces are the kind your firm can settle at acceptable values. A vendor producing high volume at low cost per case but with consistently soft injuries is not the same value as a vendor producing moderate volume at moderate cost with strong severity distribution.
How to grade it:Track severity at intake — even a simple 1-3 scale (minor/moderate/severe) works when applied consistently. Calculate the distribution of cases by severity for each vendor. Over six months you'll see patterns. Vendors whose cases skew heavily toward minor injuries should be graded down, especially if their cost per case is already at the high end of your range.
The settlement connection: Once you have 12 to 18 months of settlement data, connect settlement values back to vendor source. This closes the loop and turns severity from a proxy into a confirmed predictor. Vendors who score well on conversion and cost but whose cases settle at the low end of your portfolio are worth revisiting.
Dimension 4: Consistency
A vendor who delivers 40 leads in January, 12 in February, and 55 in March creates operational problems your intake team can't staff for. Consistency is about predictability: can you rely on this vendor to deliver volume within a defined range month over month?
How to grade it:Calculate the standard deviation of monthly lead volume over a 6-month period as a percentage of the mean. Vendors with standard deviation under 20% are consistent. Vendors over 40% are unreliable planners — you may still use them, but don't build your intake staffing model around them.
Consistency also applies to quality. A vendor whose conversion rate swings between 6% and 18% month to month is harder to evaluate and harder to staff for than a vendor who consistently delivers 11%. High variance in quality is often a sign that the vendor is mixing multiple lead sources internally and the good months are driven by factors outside their control.
Weighting the Four Dimensions
How you weight the four dimensions should reflect your firm's priorities. A suggested starting framework:
- Cost per signed case: 35% — the most direct measure of financial value
- Conversion rate: 30% — the primary quality signal you can act on quickly
- Case severity: 25% — the downstream outcome predictor
- Consistency: 10% — important for planning, but secondary to quality and cost
Adjust these weights based on what matters most to your firm. A managing partner who cares deeply about settlement values will want severity weighted higher. A marketing director whose primary challenge is justifying budget to partners will weight cost per case most heavily.
Grade
Building Your Vendor Scorecard
Turn the framework into a repeatable monthly process:
- Set your benchmarks. Define target ranges for each dimension by case type. These become the standard against which every vendor is graded.
- Grade monthly on a 90-day rolling window. Thirty-day snapshots are too volatile. A 90-day rolling average smooths out the noise and surfaces genuine trends.
- Produce a composite score. Multiply each dimension score by its weight. You want a single number per vendor that lets you rank your portfolio and identify outliers.
- Use the scorecard in vendor conversations. Vendors who see your data respond differently than vendors who only hear complaints. A scorecard with four concrete dimensions is a professional, specific basis for renegotiation or termination.
- Review quarterly for budget allocation. Once a quarter, use your rolling scorecard to reallocate budget toward top performers and away from vendors who have been below benchmark for three consecutive months.
Set Benchmarks
Define target ranges for each dimension by case type.
Grade on 90-Day Rolling Window
Smooth out monthly noise and surface genuine trends.
Produce Composite Score
Weight each dimension, calculate a single ranking number per vendor.
Use in Vendor Conversations
Share scorecard data with vendors for specific, defensible discussions.
Quarterly Budget Reallocation
Shift budget from below-benchmark vendors to top performers.
What Good Looks Like
A PI firm with 6 active vendors running this framework for 12 months typically finds:
- 1 to 2 vendors significantly outperforming their cost per case benchmark — these get more budget
- 2 to 3 vendors performing close to benchmark — these stay in the portfolio with regular review
- 1 to 2 vendors consistently below benchmark — these get a renegotiation or replacement conversation
The budget reallocation from that last category to the first is typically worth 15 to 20% more cases from the same total spend. That's not a small number. At $200,000 per month, a 15% improvement in marketing efficiency is $30,000 per month in recovered spend — or the equivalent of 10 to 15 additional signed cases.
That's what best-in-class vendor management looks like. Not relationships. Not gut instinct. A scorecard, applied consistently, using your data.