Not only is the entropy difference small, there is also an added benefit in less users having to reset their password. Forgetting how their password was capitalized is a big problem for people.
Letting improved user experience trump a tiny bit of extra security is a good tradeoff for Blizzard. They're not a bank.
FWIW, I think I read at one point that WoW accounts were worth more on the black market than credit card numbers. So security isn't totally unimportant.
Definitely not. My bank forces me to use only numbers, and only six of them. Strooonng security. The only way out of key loggers I suppose (they make me click on numbered boxes).
I wonder if this (to some extent) offsets the loss of security by converting to uppercase. I know that I have reduced the complexity of passwords I forget (often by limiting them to lowercase), so I suspect other users do the same when they reset.
Letting improved user experience trump a tiny bit of extra security is a good tradeoff for Blizzard. They're not a bank.