I agree, it's hard to sell an idea only. First, you'd have to tell someone what that idea was before they would agree to buy it. Then what's stopping them from just using it without paying? It's only an idea, so there's no way to protect yourself. Unless you could start up the site, etc so the person would have to actually buy that from you it doesn't seem possible. Hang onto it, you might find that you're really passionate about it and will find a way to make it work. Or do what I do and pass it on to a friend who will make it happen. It's nearly as fun watching someone else make your idea a reality, if you don't have the time or resources to do it yourself.