Everyone in the world has awesome ideas, me included. If I have time, I'm going to work on mine, not yours. I already don't have time to do all the things I want to do. Why would I drop everything and work on your thing instead?
Maybe you could convince me that your idea is better than any of mine and I should work on it. Its not unheard of. But you've got to get past the "I don't care" bit first, otherwise I'm just not listening.
There's only one way to do that. Instead of trying to tell me your great idea, show me your great idea. If you're a programmer, implement a prototype I can play with. If you're an artist, draw a series of pictures that can accurately show me how your thing works.
Around Pioneer I often say "patches welcome" or "working code wins". Its not because I hate you, or because I think your idea sucks. Its just that I have my own things that I want to do.
See also: Why Your Game Idea Sucks