This is great post! I would like to iterate on #5 though: HN as a community is an anomaly in that mostly everyone is likely to be much more tech-savvy than your target audience. The feedback you receive from highly intelligent, tech-savvy people is not always addressing the pain points your potential customers have. For instance, the latter can, and will pay for a wrapper service that takes a hacker 5 mins to deploy even though the product might get shot down at HN for its triviality.

This is ok and to be expected but keep in mind that a service that can be sold is usually judged not on its complexity but on the number of potential clients you can reach.

Edit: I now see that afdssfda mentioned something along the same lines below. I'll just leave this here though.