[mariust]

It's a very nice idea, but you need to take in consideration the following: Managing 10 projects with 100 backers / project so you already have 1000 people to take care + the founders of the companies, you really need to come up with some simple way to do that, otherwise it will be very time consuming.

On the other hand check in with a lawyer, I know that there are some legal issue regarding this type of project, I had a client how was having this problem(I'm not sure if it's true or not, but I suppose so) Good luck