Unless you really have a problem, you have to log off sometime.

I see no problem with providing incentives and rewards for taking a break, or better yet, parking your character in a smart spot as opposed to just pulling the plug out in the field. Also, from what I observe, the rewards are pretty minimal compared to actually playing.

CoH says you can earn salvage for logging off at a University. But if you really wanted salvage, you could spend that same 4 hours running task forces and coming out like a bandit. So there's still a trade-off.