Can you truly get behind an idea that's not your own?
SwellJoe: Of course, and I emphatically reject the premise of the question.  It'd be impossible for any great company to exist without this possibility.  Besides that, the best businesses are usually actually many ideas from many people that result in a great series of products.  Read Built to Last.  The whole point of a company, rather than a sole proprietorship, is for many people to work together for common goals.