Obviously- YC is a perfect place to learn (and practice) efficiency + frugality, both key success factors for any company, start up or grown up.
Add to that the fact that this is an excellent time to be doing a start-up(especially if you can offer a distinct cost advantage, and complement it w/ a business model that works at an empirical level).
So we ought to see some sensible wonders coming out of YC soon enough. Cheers, and good luck to all YC applicants..!