Many sites over the last several months have started to ban gold selling adds (Our site is included in that list). Gary Whitta former PC Gamer editor-in-chief posted the following article over on Next-gen: Let's Shut Down Gold Farmers. Here is a clip, for the complete article visit the link above.

The only way to really cut off gold farmers at the knees is not by refusing to take their money, but by refusing to give it to them. And that responsibility falls to you, the community of players they target.