I ran into the problem recently in Final Fantasy XIV. As a player, I enjoyed what was going on with one of the many organizations my character belongs to. The problem is that she wasn't enjoying it, and she didn't have any reason to keep subjecting herself to it. She didn't like most of these people, she didn't need money or resources from them, and she wasn't really deriving any benefit from it any longer.
Obviously, I wanted her to stick around. But every so often you find yourself in situations where your character isn't happy and wants to leave... and has both reason and opportunity to do so. Two weeks ago I talked about getting someone out of your life; now it's time to talk about keeping a character in the mix.