How this growth loop worked
Someone searches a high-intent query like "how to improve my website." They land on a free tool such as Website Grader, or a library article ranking for that term. To get their score or a gated guide, they hand over an email. That email feeds nurture sequences that pull the lead into the free CRM. What those users do and ask sets the next batch of content.
The compounding came from content behaving like an owned asset, not paid media. An article published once keeps ranking and collecting emails for years, so cost per captured lead drops as the library grows. A K-factor near the model's 0.13 never sustains growth alone; below 1, a loop amplifies, it doesn't run forever. Every dollar of other acquisition went further as blended cost fell.
Design the output to be durable. Give away something with real standalone value, a working tool or a genuine answer, and make getting it cost the input you need: an email, an account, usage data. Judge the loop by whether each turn lowers your blended acquisition cost, not by whether it goes viral. A loop well under K=1 earns its keep when the assets it builds keep paying after you stop spending.