I've always suspected blizzard has some massive security hole on their end that they either aren't fixing or don't know about. My WoW account was hacked like 2 weeks ago and I haven't logged in to the game in over two years. This is the second time its happened in that time span.

I don't go to shady sites and have scanned for keyloggers multiple times and the scan always comes back negative. So either there is something I'm missing or it is on blizzard's end. The hacking seems to be such a common problem that people just shrug it off. When I was playing, it seemed like at least once a week someone I knew was having their account hacked....sometimes twice in the same day immediately after formatting.