Hi guys.
Basically, my friend will be using RAF on me and we will level together. This means i will be making a brand new account. My question is will i have to buy the games again? Obviously i have all the games now ( as im level 80) , i have wow and tbc hardcopy, but bought wotlk online ( if this makes a difference). So when i want to upgrade the account from trial i will have to pay for the subscription , but will i have to enter my game codes again or what?? If so can i use the games that i already have and are used on this account?
Help appreciated, thanks.

The above replies are correct. Recruit-a-friend (RAF) requires that the recruited account is created through RAF, and you can't use an already activated game key to create a new account - nor can you use an already activated expansion key to upgrade another account.

However, you can do all the upgrades through the web site, so there's no need to go out and buy a new game box.