As long as they don't say, "Selling items for USD, contact my AIM" they can do it. Graal cannot do anything because the agreement and transfer of money happens over the AIM client or any other instant messenger service for that matter. Graal only governs Graal.
Yep, it's not only sad though. It's destroying the game is what i'm unhappy about. I don't care if people want to throw away their money it annoys me that they don't care about the people who have worked for hundreds of hours