Yes, I was joking. Perhaps this is not the thread for sarcasm ;)

Incidentally both Gates and Jobs started their companies sans YCombinator.

Anything's possible (you could add mark z to that list). It's about validation, resource allocation and probability.

Getting accepted to yc (or even interviewed) is indication that at least a few capable people think you and what you're doing are worth something and that you're headed in a good direction.

There is a limited amount of capital, public exposure (press) and face-time with angels/VCs/worthy advisors to go around. With YC, you get a leg up in getting access to these resources.

A YC company (historically, and for the above reasons) is significantly more likely to at least get to the next stage of funding and growth (actually employing people). Since everything involves luck, anything that improves your chances is a big deal.

I know that's an easy feeling to slip into (if you're serious), but it doesn't make any sense to feel that way. You know everything about your startup, all of its nuances and exactly how you'll change the world. PG and team know what you happened to write in response to a few questions on a very short application, and a 1 minute video. On top of that, they have to sift through thousands of these apps. There's no doubt that these guys are very good at what they do, but even if you're the next Bill Gates (or Steve Jobs if you prefer), there's a very good chance you'll get overlooked. Incidentally both Gates and Jobs started their companies sans YCombinator.

That said, best of luck!

I hope your being sarcastic! YC is only one opportunity among many.