I referred one new account from each of my 5 accounts, upgraded online, and then bought five 60 day gamecards and added them. Using the gamecard is the only way to get the mount immediately, otherwise you have to wait for the first billing cycle on the new accounts.

It'll take me 2 days to get my Shaman from 67 to 70... Once that happens I'll be starting a new team and clocking how fast I can get them to 60 hehe.