I can send a proposal regarding Bitcoin directly to the upper-management at Blizzard, without going through the low-level employees. The proposal would have to be pretty convincing, though, because I'd have to put my reputation with them on the line by sending it.
Easy. Cost benefit analysis, how much is saved over using bitcoin versus the percentages paid to Paypal and credit processors. Even better, tell them they can KEEP THE PERCENTAGE themselves since users are already used to their tier structure.
Have to wonder how much profit is eaten up by 'transaction' costs. It adds up, I'm sure.