Here’s a trap we see frequently: a market with tens of thousands of potential buyers gets pitched as a giant opportunity — when the price point per customer and realistic penetration is so low that the real, reachable revenue is a fraction of the headline. On top of that, selling and retaining auto dealer customers gets more challenging every day. Even the best products see churn to newer or lower priced innovations.
Big unit counts and rapid growth assumptions rarely add up on an aggressive schedule.
The discipline that protects you is moving deliberately from TAM SAM realistic penetration:
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TAM — every possible buyer (interesting, rarely actionable)
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SAM — the segments you can actually serve and reach, at a price they’ll actually pay
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Penetration model — a defensible 3-year share estimate and plan tied to real go-to-market capacity
When you ground it in actual price points and segment-level willingness to pay now, the picture sharpens fast. A market can shrink from “enormous” to “tens or hundreds of millions in serviceable SaaS” — and that’s the number a board can underwrite, not the vanity figure.
Thoughtful sizing doesn’t kill ambition. It aims it. It tells you which segment to win first and what the deal can realistically return.