If SE just watched the MB and followed the top selling mat's/gear's or looked in to the most prolific sellers a few times a week. It would be easy to follow the trail back to some type of botting by a MB bot or some gatherer's/crafters botting. Ban the account and anything that goes with it.

The MB is where there mostly making the gil to be able to RMT, knocking that out and there's less of a market for RMT