Well for the most part I stay in games for the following reasons:
1. I attempt to RP in every game except some of the smaller ones. Though this tends to fall flat more often than not sometimes I end up with a really enjoyable character/experience.
2. Getting connected. If your a villager without a role, you really have little to lose from throwing caution to the wind and start talking to people. Who knows, maybe you'll even cause one of those spectacles Freshmeat likes.
3. Most importantly I stay in the games for the mental challenge of trying to logically determine who's a wolf. I like to consider it a psychological brain teaser/puzzle. That's mostly just my personality though.

What makes me want to give up and die in games:
1. Good narrations. I always want to find out my death scene. Curse all you people for being good writers.