Trading Gold for Game Time

So I recently encountered a player that makes a ton of gold on the AH. Grats. But what to do with all of the virtual gold. Apparently he claims to trade gold for game time cards. Instead of accepting cash, he just gets them to buy a game card and send him the code. He also claims to not have paid out of his own pockets for gametime in over 2 years. This sounds like a good plan, but isn't this a violation of game policy, just the same as selling gold?