I'll have to second agreeing with Drew.
Something you, and all MMORPG players should remember, is that your real life is much more important than a game. You should focus on that rather than some uber character that probably won't exist in five years anyway.
I, myself, play an MMORPG, Final Fantasy XI (Avelyn, MNK62/WAR31 on Lakshmi), one of the few, I think, that tells you to always consider your life more important than the game every time you go to play it.
Throughout playing, I've used the advice given above to attempt to stop becoming addicted, and most of it is sound advice. I have even suggested the above to other players who were having real life and game balancing issues, and it has helped them out greatly. Try to limit your play time so you can focus on important things, and, if at all possible, only play on weekends, like VanB pointed out. If that doesn't help, truly consider quiting the game, and force yourself to stop.
If all else fails, toss your pc out in front of a speeding bus, then throw a party because of it. It
might work...
AMD64 X2 3800+ | 1 GB Ram | NVIDIA GeForce 6800 128MB
MSVC++ .Net 2003 | Wings3D | CharacterFX | Gimp v2.0
Formerly NWC_Omega