I don't think there is technically anything in the TOS that state you can't pay someone to relinquish their lot or similar activities. It is socially unacceptable, maybe. But it is not unlawful.

You could loosely claim that 3.2 Disruption. You may not in any way disrupt or interfere with the Game experience of other players, including the disruption of Square Enix's computers and servers. But that would be stretching it.

People are calling bloody murder simply because they fell hurt about not having a plot. Personally, I would rather have SE focus on the solution, rather than the vocal minority. The sad truth is, the average player doesn't care, because the average player can't afford 3+ million Gil. 3 million is just as unreachable as 40 million.