These sorts of systems are very much a bonus for people like me, who are confirmed altaholics. That way I can play different characters and games as suits my desire, but I won't keep falling further and further behind my more focused friends. In a game where there is no sort of mentoring system, that's very important.

And the Day Job system in City of Heroes is completely different than earning bonus experience in other games. It doesn't give you bonuses for logging out, but rather has you think about where you leave your character when logging out, instead of just disconnecting next to your last mission giver, or the trainer or whatever.