As a fellow start up founder, I see most of my job being just buying time for the business. Buying time to make, to talk, and to think.
It wasn't like the tool had no value to Susan, maybe with a booth at her go-to annual expo, mentioning a few past lawsuits the tool could avoid, and an affinity partnership with her industry association, the tool would have become a fact of life for her.
It's a lot of work, I'm not denying that. Yet, this is the sort of thing YC's idealized startup stories often fail to say. If "instant Product Market Fit" is so good, then how come practically every new high flying SV startup is using loads of VC money to "bend the market to the product"?
Exciting Startups have to venture far, it's not about "we let you buy your potatoes online" anymore. Chances are you won't get deals by talking to people once. I wouldn't say that means your idea is bad.