I've seen it happen to one person in nearly four years of playing, and only in the last month. During the month a keylogger was on there, he was hacked four times. He was never able to remove the keylogger no matter how many utilities he ran, so he ended up having to blow away the machine and rebuild it. Problem solved.

Oh, and where did the keylogger come from? Downloading pirated software from a torrent. You can be sure he knows not to run random EXE's now.

I have ZERO sympathy for people who get hacked. I've yet to hear of a case where people didn't later admit to doing something monumentally STUPID to get hacked in the first place. Go ahead - show me an example of "drive by" hacking. These aren't the pre-XPSP2 days, where worms and network attacks were prevalent. It's all social engineering, and getting people to click things they shouldn't. Which boils down to stupid end users.

Screw authenticators, and screw restoration. Let them just blow away the account and give you a new password. Get hacked again because you didn't clean up your mess? Three strikes and you're out. That will get you to clean up your computer, and Blizz and the rest of us don't have to subsidize your stupidity.