I'm very wary of 100% community developed projects without financial incentives. A lot of them don't have the consistency and continuity that 'serious users' (including businesses) need. Even on a platform that is committed to 100% fun, the Gamepark gp2x opensource linux based gaming device, the apps are very inconsistent in their stabitliy, features and performance.

I don't mind the developers of the programs that I use have fun while they do their job. But I hope they have more things going for it than just fun, I also don't mind rewarding them with cash payment or subscription if I also benefit or profit from using their work.