If you happen to be playing MMOs, then you also live in fear of the constant General spam, Whisper spam, Mail spam and various other kinds of spam regarding in-game money selling. I am (but, hopefully, used to be) a World of Warcraft player myself, and if I were to count all those messages I've got involving “PLX BUY OUR GOLDZ!” or “WWW.GAYSITE.COM SELLZ BEST!”, I would probably be losing (another) 4 years of my life.
And we also know that most gold farmers are “Chinese”. So we gank them. A lot. Well, the Chinese government has actually found a way to gang them in real life also, by collecting a 20% tax on all revenues from the redistribution of online, virtual currency. And why not? The market so far is growing, has still great potential, it it suffers from no taxes (until now) and it is a pain in the large asses of decent players who try to play a game without suffering insane, buffed, AH prices. The Wall Street Journal
has more on this.