VirusList have published an interesting report on fraud in online games, detailing the methods by which it is done and various other things that pertain to the topic.

It gives for an interesting read, and it is interesting to see just how far online gaming has come, from being a pipe dream just 10 years ago, to people defrauding the system, and selling virtual items for real cash. Amazingly, people still fall for some of the simple traps, so give it a read and learn how to protect yourself!