Excellent point. I'd also add that most good ideas are hard to recognize. Imagine trying to sell dropbox "Yeah, its like free backups meets FTP. Not sure how we're going to make money" or Facebook "Its the new myspace/friendster!"
A lot of the success is in things like marketing, good UIs, implementation, beating the competition in features, strong partnerships with other companies, creative new solutions, good policies, and lots of luck. The idea guy can't help you with any of that. The devil is in the details, not in the big idea. Most "big ideas" are plain to see, its some kind of technical or creative specialization that helps you rise past your competitors.
A lot of the success is in things like marketing, good UIs, implementation, beating the competition in features, strong partnerships with other companies, creative new solutions, good policies, and lots of luck. The idea guy can't help you with any of that. The devil is in the details, not in the big idea. Most "big ideas" are plain to see, its some kind of technical or creative specialization that helps you rise past your competitors.