And you're talking about a very new funding model. I'm not saying there are necessarily lots of examples of great movies already produced with this model. I'm saying they could easily be. A good number of projects have raised millions on kickstarter [1], including two movies [2, 3].
There's no reason the movie industry couldn't move to a pre-funding model. Or some other model nobody has thought of yet.
[1] https://www.kickstarter.com/discover/most-funded
[2] https://www.kickstarter.com/projects/1869987317/wish-i-was-h...
[3] https://www.kickstarter.com/projects/spikelee/the-newest-hot...