On evaluating applications: assuming you're looking at a solid team and a seemingly good idea, how much does having a working prototype and early traction help a startup's chances of getting into YC? Is there some level of traction that makes any application a shoo-in? Are there categories of startups that you won't even consider without demonstrated traction? On the flip side, what does it take to make you consider…
Traction helps too, but we tried not to get fooled by graphs. In fact, I always ask the other interviewers "would we fund this company if they had no traction at all?"
To fund a company with nothing built and no users, we have to believe 1) the idea is great and 2) the team is unstoppable.