But what about the bots??

[Stormfur]

Unpopular opinion incoming, but the best solution is to drive them out of business.

When I played WoW, I saw gold sellers take a nosedive (at least on my server) when they introduced the WoW Token. It's a way for one player to spend gold on game time, by buying a token that another player bought with real money. Basically buy someone else a month of sub time and they pay you in gold. The market is automatically regulated by Blizzard, no player involvement at all. Gold isn't generated, it's only transferred from one player to another.
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TERA did this too. But then again, they never really had a problem with gold sellers either. I have no idea if Enmasse has some kind of secret sauce or whatever but I'd take a page out of their playbook in that regard when it comes to RMT and spammers.