Ok, here's my crazy idea:

If you have a great idea, you post it to, let's say, 'mycrazyideahaslegs.com' and you pay the site a dollar amount reflecting your belief in the idea. If you really believe in it, you pay $1000. So, what's the point in that? Well, you then get to read all the other $1000 ideas, and those users can read yours. True, your great idea is now shared, but only amongst a small group of people. You all get the chance to execute on it.