First of all, i have a main account and you probably do too.
Now, then why would anyone that has a main account want to RaF? which means they would have to buy a new copy of WoW.
My idea is this:
I recruit you, you have to pay 5 Euro's (Discount ftw!) and we lvl a char to 60 REALLY FAST.. Then you may ask, so then i have a 60 on a classic wow account which i just made, thats no use!
Well, after we made our first 60.. we switch, you recruit me and we lvl to 60 again. This way we both have a lvl 60 on our main accounts without the need of transfering between accounts.
P.S Ofcourse it can be changed who will buy it first, because i don't want people to yell 'SCAM' because im letting you pay first. It can be the other way around, if i trust you enough.