I don't think funding is the problem. If it is well structured, then "thousands" is entirely possible. Anyway, I'm sure there will be donations separate from the members fees. I've never had trouble raising money. That is not a big problem for this community.
Accountability... now that's a problem. Getting people to spend on a worthy cause and a representative transparent organization? Not so much.
I'll donate the first $1000 the moment we hit 100 members, that's a pledge.
Thousands of users eventually but initially it might take a year before you have enough members to incorporate. I'm just thinking that not being setup might discourage users from participating (i.e. those that will wait till everything's set up).