I always liked the old school idea of active GMs hanging around in game. Considering when I was on Jenova I was able to fill my blacklist in under a week with RMT bots, imagine the damage someone with the power to ban could do to the RMT bots. Make advertising RMT in any form a flat out ban-able offense (if it isn't already) and set the GM Ban Squads loose.

Granted it's not foolproof, but it's a helluva lot more effective than the series of bandaids SE keeps throwing at the problem.