Firstly, let me get the obvious joke out of the way:
"Makes me wish I had a friend..."
But to be serious - I hate to be "that guy", but this is going to be mostly used by people that buy a new account + game time to get the mounts for their main... I've had several friends start playing WoW, while I was playing, but all but one started without even knowing about any recruit-a-friend and only told me afterwards, which was late for "recruiting them", even if I was the one who persuaded them to start playing. And, ironically, the only one that I did recruit (and that was because we were playing in the same room when he started), started way before recruit-a-friend gave even the Zhevra mount, so I only got 1 month of game time out of him (on the other hand, of course, having a good friend play a game with you is much better than any mount, so I'm not complaining :-) )