Point taken, and we do appreciate the feedback. The same can be said for KickStarter/Indiegogog/Everyone else.
We're trying to build the same model, but hoping (and assuming) that people are quicker to give their interest, and sign up as an early adopter for an idea if its built, than to open up their wallets to new ideas.
As far as giving away their idea, we're definitely going to try to do what we can to protect those posting from a legal side, or at least offer a VERY convenient way to say "hey! this was mine on this day"