Which makes the transaction costs higher than the idea is probably worth. Execution is very important, and in an ideas market, there would probably also be a lot of crappy ones. So, you have to sign a bunch of NDA like contracts, risk being sued if you ever develop anything like the things you may have seen, and probably also have to wade through a lot of junk.
While it might be sort of doable, it's probably not worth it until we have a magic pill that lets you forget the last 5 minutes of your life completely and totally.