Module 1: Lead Generation Economics & Commercial Targets
Lesson 4 · Lead Generation Economics & Commercial Targets
Lesson 4 objective
Recognise when apparently cheap Google Ads leads are creating poor customer economics and unnecessary downstream cost.
One of the most dangerous statements in lead generation is:
“CPL is down, so performance is improving.”
Sometimes that is true.
Sometimes Google has simply become better at finding people who are easy to persuade into filling in a form.
The cheapest person to convert is not necessarily the most valuable person to acquire.
1. Cheap leads can hide weak qualification
Compare two campaigns with £10,000 of spend:
| Campaign A | Campaign B | |
|---|---|---|
| Raw CPL | £40 | £100 |
| Raw leads | 250 | 100 |
| Qualification rate | 10% | 60% |
| Qualified leads | 25 | 60 |
| Cost per qualified lead | £400 | £166.67 |
Campaign A's CPL looks spectacular.
Its commercially relevant acquisition cost is far worse.
2. Low-friction conversion can create low-intent leads
Making conversion easier is not always the same as making acquisition better.
A short form with almost no qualification can increase conversion rate, but it may also attract:
Low-intent researchers
People willing to submit a form but nowhere near a buying decision.
Poor-fit prospects
Enquiries outside the business's budget, geography or service criteria.
Price-only enquiries
Prospects comparing many suppliers with little probability of purchase.
Spam and irrelevant submissions
Conversions that consume reporting and sales resources without commercial potential.
3. Sales time has a cost
Media spend is not the only acquisition cost.
Suppose 200 poor-quality leads require an average of 15 minutes of sales attention each.
That is:
50 hours of sales capacity.
If those leads produce almost no customers, the business has paid twice:
first for the media, and again for the time required to process weak enquiries.
4. Cheap leads can distort Smart Bidding
Automated bidding responds to the conversion signals it receives.
If the account treats every lead as equally valuable, Google has an incentive to find more of whichever leads are easiest to produce at the target.
If weak leads are cheaper and more plentiful, the system can progressively move towards them.
This creates a dangerous feedback loop:
Weak lead → recorded as success → bidding learns from it → more similar traffic → more weak leads → apparently efficient CPL.
5. Look for quality deterioration by segment
Do not only compare quality at campaign level.
Break it down where data volume allows:
Keyword
Which search themes generate customers rather than merely enquiries?
Search term
Which specific intents correlate with poor qualification?
Campaign
Are different structures producing materially different lead quality?
Device
Does conversion quality differ between mobile and desktop?
Location
Are certain areas generating cheap but commercially weak leads?
Lead type
Do phone calls, forms and bookings progress differently?
6. The cheapest campaign may deserve less budget
Suppose:
| Campaign A | Campaign B | |
|---|---|---|
| CPL | £45 | £90 |
| Lead → customer rate | 2% | 12% |
| Implied CAC | £2,250 | £750 |
The campaign with twice the CPL has one-third of the customer acquisition cost.
7. Do not overcorrect by making conversion unnecessarily difficult
The solution is not to create a hostile lead form or force every prospect through excessive friction.
The objective is useful friction.
Ask for information when it helps:
qualify the enquiry, set expectations, improve routing or create a better bidding signal.
Do not add questions simply to reduce lead volume.
8. Measure sales acceptance
One useful intermediate metric is:
Sales accepted lead rate.
This asks whether the sales team considers the lead genuinely worth working.
It creates a practical bridge between raw Google Ads conversions and eventual closed customers.
Interactive diagnosis
A campaign's CPL falls from £80 to £48 after broadening targeting. Lead volume rises 70%, but qualification falls from 50% to 18% and sales complains about irrelevant enquiries.
Practical challenge
Find the campaign or conversion source with the lowest CPL in your account.
Then compare its:
qualification rate · cost per qualified lead · opportunity rate · close rate · CAC
Decide whether it is genuinely your most efficient source of customers.
Knowledge check
1. Why can lowering raw CPL make customer economics worse?
2. What can happen if weak and strong leads are all recorded as identical conversion successes?
3. Campaign A has £50 CPL and 2% lead-to-customer conversion. Campaign B has £100 CPL and 10% conversion. Which has the lower implied CAC?
4. What is the strongest reason to introduce additional form friction?
Key takeaway
A cheap lead is only cheap if it retains enough probability of becoming a profitable customer. Optimise the economics of the funnel, not the apparent efficiency of the form submission.