You do have a point. However, I would then suggest applying a '$' symbol to all non-free MUDs, and then, within the MUD's Profile/Info, list a further derivation of the pay-style. If it's pay for extras, list it as such within the info. If it's monthly payments, list it as such. It's 'only' a click or two, to take a page from the P2P-advocates books.
-D
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