We’ve been using Project Wonderful for about two months now. We haven’t done a lot of posting asking users to buy ads to support us. We haven’t contacted people and asked them to buy ads on PW from us. We mostly left it alone, didn’t do much self promotion to ramp up our traffic. (We’ve been busy elsewhere.) How have we done?
Meh. Not well. That doesn’t come close to covering our current hosting. We’d probably be doing better if we had bigger ads and more ads. The fan oriented wikis that I know that us PW get comparable traffic but have more ads and bigger ads. They also actively promote their wikis in ways that we don’t. They also ask their community to buy advertisements. Those three things mean that they come much, much closer to covering their hosting costs than we could ever dream of with our current strategy.