Lead cost is useful only when the definition of a lead and the quality of those leads remain stable. If a campaign finds cheaper form fills that never qualify, the dashboard improves while the sales pipeline gets worse.
Connect media to downstream quality
At minimum, compare campaign or audience performance with qualification rate, booked calls, purchases, or another downstream signal. The useful metric is the economics of acquiring a valuable outcome—not the cost of generating an event.
Watch for optimisation drift
When platforms optimise aggressively toward a shallow conversion, they can learn to find people who are good at completing that event rather than good at becoming customers. Better signals and offline feedback help reduce that gap.
Use CPL as one diagnostic, not the verdict
A healthy review combines cost, volume, quality, conversion rate and business capacity. The cheapest source is not automatically the best source.
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