Well... I just opened this thread out of curiosity, and noticed all the keys you posted. I used a Battle Chest one, Cataclysm, and a MoP key on a new account, and they actually worked! Still, won't they get removed by Blizzard? I'm not going to buy the method, but if the keys are going to stay you're awesome.
EDIT: The keys got removed, and the account is now back to a starter edition. Thanks anyway I guess. >.>