It sounds like you have something really good going on. Hosting, servers, and other expenses will go up as you get more users, keeping the user experience fa

It sounds like you have something really good going on. Hosting, servers, and other expenses will go up as you get more users, keeping the user experience fast and pleasent will be hard. Getting that $1 up to $2 would be important. Check out RuneScape http://en.wikipedia.org/wiki/RuneScape http://en.wikipedia.org/wiki/RuneScape they have a good model.