there was a similar thread about this sort of thing a few weeks ago about a mame cabinet in a cinema or something.
Its kind of dodgy, but i cant believe people are actually buying it. People will probably say its 'unethical' to take advantage of MAME, doesnt really bother me, if someone is stupid enough to pay $75 for stuff you can get for free, then might as well make some quick cash.
but i'm guessing it wont be long before his account gets banned...