If you're being compensated for clearing content for a person in-game with in-game currency, that isn't RMT explicitly. If people can't spend the time in learning parties working toward a clear in PF or are unable to put together a static group to do the same I don't really see an issue with them turning to mercenaries to clear the content if they have the gil to spend.

(this probably should have been a reply to the other thread already about this rather than its own thread)