How to convince a friend to join me on World of Warcraft?

I need ideas to convince my best friend to left MU Online, game that he has played for over three years now, and join the “online sensation”.

He played for two months and got lvl 60 paladin. But he quit and back to MU. He never got the expansion, as was too much money beside paying monthly he argued. He complains that the expansion didn’t come with a free month.
He also has some problems using the keyboard to move the character, he prefer the clicking method. Sadly here doesn’t works very well.

He likes the way Guild Wars works, as the character moves automatically when ones click on a mob or an npc, to move closer or keep it in focus. I prefer the wow way as you move your character all the time, the game doesn’t do it for you. But he say GW is more “intelligent” about understanding and helping the player on what he wants to do.

He likes MU Online as he as advance a lot in that game, and he say, he can’t play 2 games and been paying monthly for both.

just be a best friend and respect his wants and needs, what if he was trying to convince you to join MU? would you do it? most likely not