In FFXI they had a Special Task Force designed for weeding out RMT and ridding themselves of gil-sellers. Chances are we'll see that here (eventually) but it may be awhile. I'd wager the reason we really haven't seen anything yet is they wanna get enough evidence as to just where all the sellers are coming from. That and/or, due to the game currently being in an indefinite free-trial period they're focusing on the core issues first before the release the almighty ban hammer. I see blatant and obvious bots all over the place.

You see large trains of Lalafell named "Bes" with random last names all following each other and standing around aetherytes while another does a leve to rank them up. I spotted like 3 of that very same bot family in the Hollows last night killing mobs in a single room. Currently they don't actually seem to be harming anyone (yet) so until SE does something about it best to just ignore it. What else can you do?