I think people were hacked a while ago and hackers were just waiting for Diablo's release before they set "Order 66" into motion.
I lawled at the Star Wars reference.
That is actually possible you know. Once you acquire a password for example, you dont have to necessarily use it immediately (albeit I have read, they often do).
These days, they create an exploit, test it out quietly and then spread it to as many PCs as possible... THEN, they lie low for a couple weeks and try to quietly steal as much information as possible to make it easier to hack in the future. They don't do anything obvious that would set off an alarm. They check for their target's typical "logged on" time so they know when it's safe to steal stuff without getting caught right away (like early in the morning or something)
THEN, when a big game like Diablo 3 is released, they focus on people who play a lot and who rush to pile up the best high-end loot and gear and gold. Once they pile up on stuff, the hackers wait for them to log-off and then they go into their accounts while they are sleeping or not active or whatever and strip their accounts of all the loot and gold.
By time the victim finds out, it's too late and all the "Stuff" is gone and filtered off to farmer accounts and 3rd party sites for sale.
All Blizzard can do is reset the password and restore the account. I'm sure they try to track down the gold and items via a papertrail, but it can get diluted so quickly with tons of accounts to spread the stuff out to.
I had my WoW account hacked when I only had 4 days left on my sub a few months ago. [I am SUPER CRAZY with A/V and Anti-Malware programs too - so how they got my p-word I have NO idea]
I had stopped playing out of boredom - so they KNEW I was not an active player anymore and they KNEW I had a couple days left on my paid time so they could go in and strip me. They did a paid transfer to another server and stripped my main characters. I even got an e-mail confirmation with the HACKERS last four digits of THEIR credit card (or someone's stolen credit card) - but I caught it and Blizzard restored my account.
You can't just say it's just lazyness of the victim anymore - most people who play online games these days are pretty security-aware. Now I see people with Authenticators are getting hacked too - that's not good at all.