> would the ticket you charge visitors be considered a commercial use? would you risk > in any case to be sued, when you can choose a different emulator, released under > GPL/BSD license, without the need to contact MESS developers to clarify if it's > commercial use or not?
IANAL but the commercial use clause only covers redistributions. So if you aren't redistributing MESS/MAME then I don't see how your point is relevant.