I know this is a bit screwed up, but what about bonus exp for paying customers??? Or get X exp for 10 dollars??
Some people would do it just look at e-bay.
Another possibility would be a one time charge, after 30 days of gaming, or be limited to 3 hours per day unless you paid the one time fee.
While it would be cool that is free the only other way would be to sell the server side software with customizable stuff and tools, as such anyone wanting to run their little RPG does it with this as a server, and you guys run this game as is for free, but you must support the people that buy the server software for their MUDs?it?s an idea at least, I would pay 20-60 bucks for a good easily customizable graphical mud. Never Winter Nights was being built on this premise, it is held up in legal issues. Of course you don?t have the name recognition but with some extra work you can make it so it works on a similar premise, even make it with a turn based option or something, have pleanty of GM options and such?you might want to look at the D20 license and see if you can use it, but I figure if done right you could raise a few hundred thousand dollars to keep it free, but an official organization would have to be formed and some support for users available.
Just an idea.
Paxx