Bots, gold spam, and pirates.
Well, knowing that people use the same e-mail and password all over their accounts, games and services, not beeing careful about infestation of their computers with keyloggers, and sometimes beeing simply dumb and falling to the simplest “e-mail from support: give us your passwordz” scam… Ignorance over a strength of the passwords to complete this image (the infamous 12345 or qwerty). I tend to believe the took-over accounts.