it's actually not THAT big a deal. brute force attempts will lock your account down before they get to your password + it makes it a lot easier to rememberOh dear. I've programmed guestbooks with case-sensitive passwords. Why the hell would a multi-billion money gaming company not do something so simple?
As someone who has been working on web based systems for about 12 years, case-sensitivity is always a happy side affect of hashing for storage over being implemented for security purposes.