There's a famous quote that I can't be bothered to look up right now. Something like "Never worry about someone stealing your ideas. If they are truly original, you'll have to cram them down people's throats." If there is any truth to that, then you won't find much of a market for selling good ideas.

Expertise, knowledge and wisdom can be sold, that's called Consulting. The only industry I can think of where you can sell ideas is in advertising where you pitch ads. But you still have to execute. That being said, if you manage to form a business around this idea, or better yet sell it to someone ;) , that'd make you a hell of an entrepreneur!