An idea isn't worth that much. It's the execution of the idea that has value. If you can't convince one other person that this is something to devote your life to, then it's not worth it.
Joel SpolskyRemember, just because Microsoft can do something, doesn't mean you can. Microsoft makes their own gravity. Normal rules don't apply to them.
Joel SpolskyIf your goals is to produce something of permanent value, you start to think differently about you want on the site.
Joel Spolsky