Sometimes, they just love the work, although becoming addicted to it, in that way, is often unhealthy. In other cases, there is definitely a desire to escape from the home.
Aah, it is, indeed, something to ponder. The trooper is a self-admitted workaholic and like LAW48 said, he truly loves his work. However, I've noticed since I live here he doesn't volunteer for every shift opening like he did when living alone. He does, on the other hand, keep busy working around the house even on his days off. Of course, I think up a few "jobs" for him to do that keep him quite busy and satisfy that need in him to work!! LOL