Its a fact blizzard need to clean their house up but the hacking isnt common.
For amazon alone, they said 2.5 million people pre-ordered diablo 3 from them.
So lets assume blizzard sold 3.2 million worldwide.
Let say 1% of diablo accounts were hacked.
So, even 1 percent (32,000) is a lot.
I dont see 32000 people flooding the US, asia, europe battlenet diablo forums about hacking.
That's because you're assuming 100% of the 1% will be actively posting on the forums. A majority of people who have issues call phone support. A small percent of users will use support tickets. An even smaller percent will actually post on the forums.
If I have a problem with a Newegg order or something of that nature the first thing I'm doing is calling them. Then I'll hit the website for anything else I need to do. If the problem is solved on the phone then I never reach their online support let alone community forums.
If you extrapolate the 1% rule from the total reports (let's say it's about 400).
400 people posted on the forums about this issue
400 is 1% of 40,000
40,000 is 1% of 4 million
So we have 4 million estimated sales, 40.000 people have this issue, 400 of them posted on the forums. I personally feel it's more because it's not like the issues have stopped. There are more reports coming in all the time. The 1% number is now climbing.