Let's say for every one content creator that are on average 100 eyeballs on the content they create (1:100). Almost universally, the 100 eyeballs can be translated to more economic value than the 1, and hence why the advertising model is so lucrative.
build your network with App.net and users can basically just opt-in automagically importing their data from other App.net networks thereby reducing the friction and hopefully making it easier to over come the ghost-town problem.
build your network with App.net and tool makers (including you) automatically get a well defined/robust/tested API to write apps against to interact with your network.