Applying a single attribution model, like last-touch, to all channels is a mistake. It undervalues top-of-funnel activities and can lead to budget cuts that starve the pipeline. Instead, measure each channel based on its intended outcome and funnel stage.

When testing a new channel, don't isolate its budget or performance. Immediately include it in your overall blended CAC calculation. Because the initial test spend is typically small relative to your total budget, it won't significantly skew the metric but provides an accurate, holistic view of acquisition costs.

Establish a single, blended CAC target across all marketing channels. As long as your total spend stays below this number, you have the flexibility to continue spending and experimenting with new channels without being beholden to the short-term performance of any single one.

Channels with high direct CAC often contribute to brand awareness that results in conversions on other platforms. A siloed view would cut these channels. A blended CAC approach values their overall contribution, allowing longer-term, brand-focused plays to run without being penalized for poor last-touch attribution.

Using a blended CAC doesn't mean ignoring individual channel performance. Use the blended number as your high-level strategic guide. When it rises, dive into the siloed, channel-specific metrics to diagnose the root cause of underperformance and make tactical adjustments.

A blended CAC across all channels hides crucial information. By calculating CAC for each individual platform or method (e.g., paid ads, content, outreach), businesses can identify their most efficient channels. This allows them to reallocate budget and effort to the highest-performing areas for more profitable growth.

Don't combine branded and non-branded search when calculating channel CAC. Branded search converts users who already know you from other efforts, making its CAC artificially low. Separating them is crucial to accurately assess how well your ads are acquiring truly new customers.

Standard attribution models often fail to credit upper-funnel activities. A blended CAC mitigates this by focusing on total investment vs. total customers, implicitly valuing channels that influence conversions even if they don't get the final click. This prevents prematurely cutting channels that assist others.

Instead of optimizing each channel in isolation, establish a single blended CAC target across all marketing efforts. This provides a holistic view of performance, preventing premature cuts to channels that assist conversions attributed elsewhere. It acts as a single health metric for your entire acquisition strategy.