That's why it's nontrivial to do what we do. The best ideas always look like bad ideas.

A good test for your reaction to a startup idea is "would I have said the same thing about Dropbox when it was first started?" On the face of it, there was nothing revolutionary about Dropbox. There were already dozens of similar things.

There are a lot of domains where the people with least experience tend to have the most definite opinions, but startups are an extreme case of it. I find that as I get more experience with startups, I am extremely reluctant to dismiss ideas that seem unsexy, or crazy, or (my favorite) "toys." In fact, when we use those terms to describe ideas to one another during YC interviews, we usually mean them as compliments.