It has the potential to reduce the impact of RMT farming houses, though. The legal outlet for RMT in the game reduces the demand for the illegal ones (because why risk getting banned when you can get what you want without that risk?). This happens in EVE with the PLEX system where people buy with ISK other peoples' game time purchased with real money. Then, if the RMT farmers try to use the legal market, and Blizzard cares, they can easily trace back transactions and figure out that x account is an RMT farmer from China.