I think it's all about trust. I wouldn't give money on a project just because the idea sounds great, but also because I can be sure the people behind it will actually put all their strength in its realization.
For example, few years back, I donated money for a French webserie. They wanted 35000€ to make a film, they broke the european record when ended up having 681 046 € instead. In the end we got 3 full length high quality movies, which were actually pretty awesome by the way.
So yeah, crowd funding is great. But you should really think twice before donating. Is this really such a great idea ? If yes, can I trust the team to actually make it happen ? Cause after all, it's your money.