I know, but is it not true that some MMOs and MMORPGs do not charge monthly fees? As I mentioned in another topic, the only MMO I would buy at the moment is Guild wars or Guild Wars II, for they do not charge monthly fees to access their severs. Thus someone, like myself, who likes to switch games multiple times per week could stop playing for a month or two and come right back without the hassle of buying another subscription.
Guild Wars can't be considered an MMO. The only time that first M comes to play is in select glorified chatrooms. Guild Wars 2 promises that will be different, but there's no telling at this point.