Blizzard posted a strong statement on their site condemning those who buy and sell in game items and money with real money. The threat was both to banning any accounts found doing this and taking legal action against the sellers. Those who have followed our site in the past know that we have taken great pains to turn down the advertising dollars offered by these companies, even when many other sites have willingly run their ads, and even though their offers have been very lucrative. I feel very strongly that these activities ruin the games we play and should be dealt with harshly. Here's hoping that, unlike some of the other game companies, Blizzard follows through with their threats and keeps these sellers out of their game. This is far too good of a game to be ruined in this manner. Here's the full text of what was published on the official site:
We also want to remind potential buyers in the game to please refrain from buying in-game property with real money. We understand the temptation to purchase better items, but Blizzard, and not the seller, does own all in-game property. In addition, we feel that characters can find ample equipment and money within the game through their own adventuring and questing. Please understand that if you do purchase in-game property from sellers on eBay and personal sites, we may temporarily suspend your account, and at the very least, delete the offending items.
Thank you for understanding our position. Blizzard Entertainment is committed to maintaining the atmosphere of fair play and fun in World of Warcraft.