The cheapest growth I ever found wasn't new users — it was the customers who never meant to leave
For a long time I thought "growth" meant one thing: more signups. More ads, more content, more launches, more people at the top of the funnel. So that's where all my energy went.
Then I did some boring math that changed how I think about it.
Every month, a slice of my paying customers were disappearing — and when I actually looked, a big chunk of them hadn't churned on purpose. They hadn't cancelled. They hadn't complained. Their card just failed to renew (expired card, insufficient funds, a random bank decline) and the subscription silently died. No angry email, no exit survey. Just gone.
That hit me harder than any funnel metric. These were people who had already said yes. They wanted to keep paying. I just quietly let them slip because I wasn't paying attention to the least glamorous part of the business.
Here's the reframe that stuck with me: acquiring a brand-new customer might cost you 5-10x what it costs to hold onto one you already have. So the "cheapest" growth channel isn't a new ad campaign — it's plugging the leak of customers who were never trying to leave in the first place.
A few things that helped me:
• Actually measure involuntary churn separately from voluntary churn. Most dashboards lump them together and hide the problem.
• Treat a failed payment like a support moment, not a dunning notice. A human, helpful "hey, your card didn't go through" recovers way more than a cold system email.
• Retry intelligently, not blindly. Timing and tone matter more than most people think.
This rabbit hole is actually what led me to start building Revova (a tool to find and recover this lost revenue), but honestly the mindset shift matters more than any tool: retention IS growth, it's just the unsexy half nobody posts about.
So I'm curious how the IH crowd thinks about this:
Do you track involuntary vs voluntary churn separately? And has anyone here found that fixing retention moved the needle more than chasing new signups?
Would love to hear real numbers if you're open to sharing. 🙏
this is the most underrated lever in SaaS. involuntary churn is usually a bigger share of total churn than people expect, and its almost pure recovery since these people already want to pay. two things that move it fast: smart retries (retry a failed card on a schedule, not just once) and pre-dunning, email them before the card even expires so it never fails. way cheaper than replacing them at the top of the funnel. great perspective
Your point about treating a failed payment as a support moment instead of a dunning notice really resonated. I have seen founders pour energy into acquisition while a double digit percentage of existing revenue quietly leaks from payment failures they never segmented out. The lumped churn metric hides it completely.
Do you find the retry timing strategy differs significantly between B2B and B2C? Card decline patterns seem to vary a lot by payment method.
I like the distinction between voluntary and involuntary churn because it reminds me how easily one metric can hide very different stories.
Two customers may produce the same outcome, but for completely different reasons. One made an intentional decision to leave. The other simply never completed the renewal they already intended to make.
I've started becoming cautious whenever different user journeys get collapsed into a single number. The metric is useful, but the next question I usually ask is, "What different paths produced this result?" That's often where the more actionable insight lives.