Cost per lead is the number vendors put in front of you because it is easy to produce and it almost always looks good. Cost per sale is the number they hope you never ask about. One measures activity. The other measures whether you actually sold a car. Understanding the difference is the fastest way to stop overpaying for the wrong sources.
Why Cost Per Lead Is So Flattering
A lead is cheap to generate. Drop a form on a landing page, run some traffic to it, and the leads pile up. A vendor can show you a cost per lead of 15 dollars and call it a win. The problem is that a lead is just a name and a phone number. It is a promise of a possible sale, not a sale. And promises are easy to manufacture in bulk.
That is why cost per lead trends down and to the right on almost every vendor report. It is the metric most within their control and least connected to your bottom line. A vendor can lower cost per lead simply by buying cheaper, broader traffic, which usually means less qualified shoppers. The number on the slide improves while the quality of the people calling your store quietly gets worse. You are being shown progress on the one measure that is easiest for them to move.
A Cheap Lead That Never Closes Is Expensive
Here is the trap. Imagine two vendors. Vendor A delivers leads at 20 dollars each and closes them at 10 percent. Vendor B delivers leads at 35 dollars each and closes them at 25 percent. On cost per lead, Vendor A wins easily. On cost per sale, it is not close.
- Vendor A: 20 dollars per lead, 10 leads to sell one car, 200 dollars per sale.
- Vendor B: 35 dollars per lead, 4 leads to sell one car, 140 dollars per sale.
The expensive lead was the bargain. A cheap lead that never closes is the most expensive thing you can buy, because you paid for it and got nothing back. There is a hidden cost on top of that, too. Every dead lead is time your BDC and your salespeople spend chasing someone who was never going to buy. A store that floods its team with cheap, low-intent leads is not just wasting ad dollars. It is burning payroll and wearing out the people who close deals for you.
How Close Rate Reframes Vendor Value
Close rate is the bridge between cost per lead and cost per sale, and it changes everything. Once you factor in how often a source actually converts, cheap and expensive trade places. A source that sends motivated, in-market shoppers is worth paying more for, because your team spends less effort turning them into buyers.
This is why you cannot judge a vendor on lead price alone. Two vendors can charge the same per lead and deliver wildly different value, and the only way to see it is to follow the lead all the way to a signed deal. Picture two third-party sites billing you nearly the same amount each month. One sends shoppers who ask about a specific stock number and show up for appointments. The other sends tire-kickers who requested a payment quote on twelve vehicles across five brands. Same cost per lead on the invoice, completely different value on the delivery board.
What to Ask Every Vendor
Stop asking what a lead costs. Start asking what a sale costs. Push every vendor to tell you not just how many leads they sent, but how many of those leads became delivered vehicles. If they cannot answer, that is your answer. It means they are measuring their own effort and asking you to pay for it regardless of the result.
Own the close rate data yourself. Match leads from each source back to your DMS and calculate cost per sale by vendor. When you manage to that number, the wrong vendors get exposed fast. You do not have to take anyone’s word for it. Your CRM knows which leads came from where, and your DMS knows who signed. Put those two lists next to each other and the truth is right there in front of you.
Frequently asked questions
Is a low cost per lead ever a good sign?
Only when it comes with a strong close rate. A low cost per lead paired with a low close rate is a warning, not a win. Always read the two numbers together, because one without the other tells you almost nothing about whether a source sells cars.
How do I calculate close rate by source?
Take the number of leads a source sent in a period and the number of those specific leads that became delivered units in your DMS. Divide sold units by total leads. Do it source by source rather than blending everything together, because the blended average hides your best and worst performers.
What if a vendor refuses to discuss cost per sale?
Treat that refusal as information. A partner confident their leads close will help you trace them to sold cars. A vendor who insists on being judged only at the top of the funnel is telling you where their comfort ends and your risk begins.
These are the numbers you should own, not rent from a vendor. See how VCTRS helps dealers hold every vendor accountable on our vendor accountability page.