Why should they accept bitcoins? Aside from you just wanting them to, that is. Who is unable to pay them in a currency they accept but who would pay them in pretend internet coins? Do even five of those people exist?
You're right in your first post, this is a complete waste of your time. But that's not an uncommon theme with bitcoiners.
Oh, look it's a troll!
@ OP: Sending them an e-mail would be a good idea. Try to see if you can find someone somewhere, who knows someone who works slightly higher-up in Blizzard, etc etc.
I think that Blizzard accepting Bitcoin may be a very nice boost for Bitcoin.