Zynga goes after virtual currency sellers

Unfortunately, there's nothing virtual about the lawsuit, which accuses the auction site of trademark and copyright infringement.

In theory, players can increase their virtual bank balance only through play and buy buying it directly from Zynga. But playersauctions.com allows users to buy and sell their Zynga game virtual currencies and virtual goods for real-world money. While this is against Zynga's terms of service, users may well not be aware of this, and the company does brisk business.