The CAC:LTV Ratio Disqualifier
- Cormac Repman
- 5 days ago
- 3 min read
I sat in a discovery call last month with the owner of a medical billing services firm. Twenty years in business. Strong track record. Real problem to solve. But five minutes into the conversation, I realized we had no deal at all. The math was already broken.
Here's what happened. They were looking for new lead generation because their referral business had collapsed post-COVID. Fair enough. They told me their customer acquisition cost (CAC) budget was $15,000 per new customer. They were comparing us against another vendor who quoted them at $250 per meeting. Our actual price was $1,000 to $5,250 per meeting depending on criteria. So immediately they thought we were too expensive.
But the real problem wasn't the price. The real problem was their unit economics.
Their average contract value (ACV) was approximately $1,500. Let me do the math for you. If they spend $15,000 to acquire a customer worth $1,500, they need to keep that customer for ten years just to break even. Ten years. In medical services. The reality is most customer relationships churn much faster than that.
This is the CAC to LTV ratio disqualifier in its clearest form. The ratio was roughly 10 to 1. Unit economics don't care about your sales pitch or your product quality or how perfectly you solve their problem. They just veto the deal before you even get started.
What struck me most was that we discovered this in conversation, not upfront. I should have filtered this out in the first fifteen seconds. Not because there's anything wrong with their business. There isn't. It's a solid firm doing important work. But their unit economics are fundamentally misaligned with a high touch lead generation service like ours. They need volume channels. They need $10 cost per qualified conversation, not $1,000. They need email lists and webinars and SEO. They need a different go-to-market entirely.
The lesson I took away applies whether you're selling SaaS or services or consulting. You need to know your prospect's unit economics before you know anything else. Not their annual budget. Not their growth targets. Not their timeline. Their actual CAC tolerance relative to their actual ACV.
Here's how I think about it now. On discovery calls, I ask three questions early:
First: What's your annual revenue per customer on average. Get the real ACV number.
Second: How long do customers typically stay with you. This tells you the LTV multiplier.
Third: How much are you currently paying to acquire a customer, or how much would you be willing to pay. This is the CAC number.
If the CAC is more than 20 to 30 percent of the first year ACV, the math is already working against both of us. I can't fix their business model. Neither can they in the near term. And spending six weeks on a pilot that was doomed from month one helps no one.
The owner of that medical billing firm was gracious about it. We actually pivoted and discussed a different approach for them that might align better with their economics. But I should have done this calculation before the call, not during it.
The hardest part of this business is saying no to deals that feel like they should work. The owner was legitimate. The problem was real. But the math was wrong. And math beats intent every single time.
Put the CAC to LTV filter at the front of your qualification process. Make it a discovery call gatekeeper. Calculate it before you spend energy on positioning or customization or runway estimates. You'll save yourself weeks of effort and protect your prospect from a path that was never going to work anyway.
That's the insight. Unit economics veto deals before people do.
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