A £20 lead can be more expensive than a £100 lead once contact rate, qualification and sales are included. I would compare cost per qualified lead, appointment, opportunity and sale before deciding which campaign is working. CPL is a useful diagnostic metric, but it is not the final business result.
Cost per lead is easy to understand, easy to report and very easy to optimise in the wrong direction.
I have seen campaigns improve their headline CPL while making the sales team's life worse. The platform finds more people willing to complete the action, but that does not always mean it finds more people willing or able to buy.
The simple maths that changes the result
Imagine two campaigns:
100 leads, 10 qualified, 2 sales. That is £1,000 per sale.
40 leads, 20 qualified, 8 sales. That is £300 per sale.
Campaign A wins the CPL report. Campaign B wins the commercial argument.
Platforms optimise towards the event they can see
If Google or Meta only receives a form submission, it looks for more people likely to submit the form. That is rational behaviour from the platform.
The manager has to decide whether the event is a useful proxy for revenue. If not, the account needs better qualification, deeper conversion feedback or both.
Why cheap leads often become poor leads
- The form is so easy that people submit without much intent.
- The advert makes the offer sound broader or cheaper than it is.
- Locations include areas the business cannot serve.
- The campaign targets an earlier, more casual stage of demand.
- Spam, duplicates or invalid details are being counted.
- The sales team responds too slowly and good leads become unreachable.
I would check each of those before declaring that the platform has suddenly found a bad audience.
Lead quality and follow-up are connected
A genuine lead can look poor after six unanswered calls from an unknown number or a response two days later. Equally, fast follow-up cannot rescue somebody who never understood the offer.
I want paid media and sales feedback in the same conversation. Contact rate, response time, qualification reasons and close rate help show where the problem really starts.
The metrics I would add after CPL
- Contact rate
- Cost per contacted lead
- Qualification rate
- Cost per qualified lead
- Appointment or quote rate
- Cost per sale
- Revenue, margin or expected customer value
A small business does not need a perfect dashboard for all of these on day one. Even a weekly qualified-versus-unqualified count is a better start than CPL alone.
When a cheap CPL really is good news
A falling CPL is valuable when the later rates hold up. If contact rate, qualification and sales stay stable while lead cost drops, the campaign has genuinely become more efficient.
That is why I would not ignore CPL. I would place it in the funnel where it belongs instead of treating it as proof of profitable growth.
Common questions
What is a good cost per lead?
A good CPL depends on qualification rate, close rate, customer value, margin and capacity. There is no useful universal benchmark without those numbers.
Why are Meta leads cheaper than Google leads?
Meta can create demand and uses low-friction lead forms, while Google often captures people already searching. The cheaper source is not automatically worse or better; compare downstream quality.
How can I improve PPC lead quality?
Clarify the offer, tighten location and intent, add sensible qualification, improve follow-up and feed qualified outcomes back into campaign decisions and bidding where possible.
Official platform sources: Google Ads guidance on generating high-quality leads. The practical recommendations and interpretation above are my own.
Layton Weatherall
Layton is a freelance Google Ads and Meta Ads specialist with more than eight years of hands-on experience across ecommerce, lead generation, B2B, tracking and paid media strategy. He works directly with businesses in the UK, US and internationally.
More about Layton →Getting plenty of leads but not enough customers?
I can review the traffic, forms, conversion goals and sales feedback together to find out whether the account is buying volume or creating useful opportunities.
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