Their stance is they would prefer to avoid false bans on people for gold buying. They lose more money by upsetting the community than allowing people to buy but ban the seller. I wish they could ban both parties but the truth is, its easy to have ingame trades look like a gold sell. That being said, they should get a system to track GS gains in a single week. They have a GS tracker on the site, I dont think it would be hard to catch some of our more obvious buyers.