How is this not a complete waste of time since it's so exploitive of developers? Oh, that's right, being part of the startup-hype bubble machine entitles you to a magic wand that allows you to step beyond economic reality. Wave the wand, voila! we're so awesome, we're the next Google, we might as well print our own money!
If you're a good developer, you'd probably do better soliciting micro-loans through paypal and Prosper. I suspect any developer who has another option takes it. I myself have several modest software ideas I've been kicking around for two years that might have a small chance for making a good startup. But being paid a subsistence wage, even as an alpha-stage startup, is worse than just keeping the ol'day job and pushing the prototypes as a hobby. Y-Combinator seems to be more for high school and college kids along the lines of Google's annual summer of code.