I think a better model would be just to get users paying five bucks a month, and then to evenly divide that up among the stories each person votes for. Then you just have to get 100 users to sign up to get the thing underway. With the current strategy both the amount you are expected to pledge and the number of people needed to get the thing to hit it's tipping point are kind of nebulous.

Anyway I like the idea. I'll probably sign up once it's out.