The cheapest lead is usually the most expensive
Cost per lead tells you how cheaply you bought a phone number. Here is how to measure lead quality, cost per sale, and what your marketing really returns.
The marketing report arrives every month, and the number at the top is cost per lead. It went down, so the meeting is short and pleasant. Down the corridor, the sales team says the leads are getting worse.
Both can be true at once. Cost per lead measures how cheaply you bought a name and a phone number. It says nothing about whether that person will ever buy.
Two campaigns, one budget
Take two campaigns that each spend AED 2,000 in a month. The numbers are invented to make the point.
| Campaign A | Campaign B | |
|---|---|---|
| Spend | AED 2,000 | AED 2,000 |
| Leads | 100 | 40 |
| Cost per lead | AED 20 | AED 50 |
| Sales | 2 | 8 |
| Cost per sale | AED 1,000 | AED 250 |
On a cost-per-lead report, Campaign A wins easily. A marketer judged on that number will move budget from B to A, and will be praised for it. The business then pays four times as much for each customer and wonders why growth has stalled.
The numbers are made up, but the pattern is real. When I followed real enquiries all the way to payment, the cheapest leads were not always the best ones.
Why cheap leads are cheap
Ad platforms are very good at finding you more of whatever you ask for. Ask for form submissions, and they will find the people most likely to submit a form.
Those are not always the people most likely to buy. A form that opens inside the app with the name and number already filled in takes two taps to send. It gets tapped by the curious, by people who misread the offer, by job seekers and by competitors. All of them count as leads. All of them lower your cost per lead.
A little friction filters them out. One honest question on the form, such as budget, location or timing, will raise your cost per lead and improve almost everything after it.
What to measure instead
For every source of leads, you want four numbers: leads, qualified leads, sales, and the revenue from those sales. From those you get cost per qualified lead and cost per sale, which are the numbers worth arguing about.
Getting them takes three unglamorous habits.
Every lead carries its source. The campaign, the ad and the keyword should travel with the enquiry into wherever your leads are kept. If your records show a name and a phone number and nothing else, the trail ends there.
Sales records what happened. Every lead gets an outcome, and lost leads get a reason from a short fixed list: no answer, wrong service, outside the area, price, bought elsewhere. Five reasons are enough. Free-text notes are never read.
Someone joins the two every month. One person, one sheet, one hour. Sources down the side, outcomes across the top.
A spreadsheet is enough to begin. A CRM makes it less painful and harder to forget. I ended up building a reporting tool to do the joining for me.
Speed is part of quality
A lead who waits until tomorrow is not the same lead who enquired today. They have cooled, or called someone else.
So before you blame a campaign for poor leads, check how long those leads waited for a first response. If the answer is hours, the data is telling you about your follow-up, not your advertising. An instant notification to the right salesperson and an automatic acknowledgement to the customer are small automations that change the picture quickly.
Tell the platforms what a good lead looks like
Google and Meta can both learn from what happens after the form. Google Ads accepts conversions imported from your CRM. Meta does the same through its Conversions API, and can optimise a lead campaign toward the leads your sales team marked as good.
Once the platform knows which enquiries became customers, it goes looking for more people like them. Your cost per lead will probably rise. Your cost per sale should fall. That trade is the entire point.
The conversation to have with sales
None of this works unless marketing and sales agree on two things.
The first is a one-sentence definition of a qualified lead. Not a feeling. A sentence both teams would mark the same way.
The second is a rhythm. Once a month, both teams look at the same sheet. When that happens, the old argument about whether the leads are any good turns into a more useful one: which sources deserve more money.
One question to ask this month
The next time a report says cost per lead went down, ask what happened to cost per sale. If nobody in the room can answer, you have found your next project.
Setting up that path from enquiry to sale is work I take on.