How are they "less than zero" if they gave you an idea that a) you would've never thought of yourself in any amount of brainstorming or b) was so insanely great that you jumped at the chance to actually do it.

Would people who are passionate enough to really think things through with their idea contribute less than zero? I'm not talking about the fictional coked-out, fast talking movie exec with logline "business plans" that want 60% + a seat on the board. If you're talking with that kind of person, then of course you don't take it on.