If you have an open-market in-game commerce system (as I definitely favor), you can't stop RMT. I think that's ok. The worst part of RMT (imo) isn't the out of game money changing hands, it's the effect it has in game a la spammers and farmers who are hogging game assets for the sole purpose of RMT.
So if you can stop the worst offenders and reduce the in-game impact as much as possible, I'd call that a victory. But, again, even just stopping the worst of it and letting the small stuff go takes a significant investment of resources-- an investment I think is worthwhile.
Unfortunately since most (All) of these games release completely broken from the ground up, I would have to say I disagree because I would rather see resources and investments made in just about anything else besides stopping something which really can never be stopped and in some cases, have a lot of money folks just trying to figure out how to cash in on the piece of the pie - which is their right to do since it's their IP.
Since the entire MMORPG genre is a broken, segmented mess due to decades of abuse, neglect, stupidity, unethical behavior, etc - I hope people that are trying to still make a dollar and a cent on these games realize they had better take care of A, B, and C first, since hardly any of those were handled correctly to begin with, before thinking about Q.
I mean, it's pretty much do or die at the moment to see if there is even enough interest in a resurgence of the genre. Most people have moved on, and as the not so great management at SOE once stated in 2000 "It's when the bitching stops, that's when you have to worry" well, the bitching stopped years ago.

Now, no one cares. If something comes out, they may give it a try, but the amount of invested consumers is down to a sliver of what it once was.
Which is why if anyone here wants to do any of these guys over at McQuaid's company any favors, they should remind them to ignore every single poster on their web site talking about crap that was already figured out when I was playing the release of Diablo 1, and make the game they want and leave it at that. Just make sure the damn thing works this time and people actually give a shit to play it, before trying to worry about RMT. This game will most likely not even have the population for RMT companies to care anyway.