The comparison is useful, but one thing I'd add is that channels aren't just acquisition mechanisms—they're evidence.
Before PMF, I'd care less about finding the cheapest CAC and more about finding the channel that consistently reaches people who immediately recognize the problem you're solving. Once you've found that, optimizing CAC becomes much more meaningful because you're improving a system that's already proven to work.
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Too many technical founders build a great SaaS, then stall because they don't know where their first customers will come from.
Acquisition SaaS exists to fix that.
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The comparison is useful, but one thing I'd add is that channels aren't just acquisition mechanisms—they're evidence.
Before PMF, I'd care less about finding the cheapest CAC and more about finding the channel that consistently reaches people who immediately recognize the problem you're solving. Once you've found that, optimizing CAC becomes much more meaningful because you're improving a system that's already proven to work.