Cost per lead is the number most small teams optimise for. It's easy to see, easy to compare and easy to lower. That's exactly the problem.
Cheap leads can be expensive
A campaign that produces leads at half the cost looks like a win. But if those leads rarely answer the phone, never book a call and almost never buy, the real cost of each customer goes up, not down.
The cheapest lead is the one that turns into a customer.
Judge campaigns on deals
The fix is to follow each lead through to the outcome. When every lead carries the campaign, ad and audience that produced it, you can compare campaigns on the numbers that matter.
- Cost per lead: how cheaply a campaign fills the top of the funnel
- Cost per qualified lead: how many of those leads are worth a conversation
- Cost per deal: what it actually costs to win a customer
Start small
You don't need a data team for this. Pick one pipeline stage that signals real intent, such as a booked call or a quote sent, and start comparing campaigns on it this week.