It's impossible to permanently get rid of RMT. No MMO has been successful on that mark, though plenty make it easier to report them. Sadly, so long as there is a market for RMT, there will always be RMT spam. It's a sad truth.

But I do wish that they implemented WoW's method their players can use to deal with RMT spam. Right click name> Report Spam> Mute's RMT spammer for as long as that character is logged on (essentially a temporary blacklist that doesn't fill up the blacklist). Still, FF XIV's RMT report method, though slow, is more than what Aion has.