swa66 - 2:23 pm on Jun 13, 2010 (gmt 0)
What makes your idea unique? What does is add ? Why are you the one who can do it (better) than the others? What keeps others from doing it as well (or even better)?
No good answers to all of them: very difficult business.
A "bad" idea that's unique can have success. A "bad" idea that has dozens if not hundreds of existing players in the field, will never work unless you find significant differentiators.