I think it all depends on what's going on, how long you're staying AKF, etc.
For example, sometimes when I'm hanging around in a map, and things are slow, I will sometimes open up my email or another window to work on other things. Of course, I'll check in with my FH window periodically (usually every 30 seconds to 3-5 minutes) for any whispers or people derping, but otherwise I will be effectively "afk."
Even though I'm not, just. My attention can be compromised at times if I have a lot on my hands outside the game, but I like to be online if I'm needed. o:
Or, sometimes I'll hop away from my keyboard for a few minutes if I need to take the dogs outside, talk to someone, grab some food, little things like this. Generally if I'm going away for 10-15+ minutes, though, I'll simply log out.
However, people that will hang around for hours, or even a day or more at a time without moving, well. That's asking to be trolled, and no, there probably isn't much point to it. The only exception I can think of are these "reference characters," which I see in Bonfire sometimes. I've seen individuals make the best TLK or movie-canon characters with accurate colors, put their color codes in their bio, and they'll be there for other RPers to reference their own characters from.
But, this isn't much fun as far as the game goes.
I suppose it's what you make of it, but I agree that it can sometimes be a little sad when you go to talk to someone, and they're.. Well. Anywhere else. xD