Square, if youre going to ban Gil buyers, give them a PERMANENT ban

[Risvertasashi]

A temporary ban isnt going to solve much. Once they buy it, its likely theyre going to buy more gil after the ban is lifted, more buying, more RMT. It will also show that you have a zero tolerance towards buyers. Buyers are just as bad, if not, worse than the sellers. They let this cancer grow without any concern for its community or the game itself.

Actually, people usually don't repeat an errant behavior after a temporary ban.