The more there are cooks, the worse is the soup.
            I've been doing a thing like that with my sister for ages and it is splendid, absolutely brilliant. It's fun to write and the result is mind-blowing. That's because it is just me and her and we have similar knowledge of things, and we get each other. But the more there are people taking part in a thing like this, the worse it will be (sorry to be so horribly blunt, but that's a fact). Maybe you should consider a few worthy partners and do it with them, without allowing just anybody to barge in to write, without really getting the thing, and then letting the community enjoy it?