It's basically about the ingame.... For example if all of your teammates are already dead and then you're the only one left in the game what would you do???
I would never hide or try to stay alive. Me sitting there in the dark will bore the people on my team who can't respawn. The pubs would be watching me do nothing and would probably leave if it took too long. That's usually when I pull out a real gun and Rambo. The other players usually get a kick out of it if you can get a few and it ends the round faster.
I agree with pet rock, as usual. I've been bored waiting for another player to die. I usually hide for a bit and wait for them to get a little closer to me, and then I ambush them, but I always die. I take 2 or 3 with me though.