If you want to get visciously addicted to something, play EverQuest. Haha..
The Sims is pretty fun. I think I only have like two expansions.. Living Large and Unleashed (more items and pets). Living Large made it interesting for a few more days after I got tired of it. Unleashed adds like ten neighborhoods and the ability to make shops and stuff, it's pretty cool I guess. I just like making a huge house, inviting everybody over, and erasing all the exits.. haha, or putting them all in a one room house with a fireplace.. or making them go in the pool and then taking the ladder out..
err.. yes.