I'm sorry to butt in on this discussion - I'm not an 'uber-player' or anything, so forgive me if my answer to this thread sounds a little simplistic...
Basically - IMHO - I don't think in a simulation as realistic as ArmA2 we can any longer talk about 'camping' (in terms that we would if we were talking about arcade games like CoD4, for example).
You do what you do in ArmA2 and if you 'camp' in the sense that we are used to teh term in any other game, you ARE NOT unfairly taking advantage or exploiting a loophole in the game - you are just employing good tactics taking advantage of your enemies weakness.
In the real world soldiers are never accused of being 'campers' - but 'camping tactics' are taught as part of basic field operational training as POSITIVE ways to take out your enemy.
I think that in the ArmA2 world - being a simulation - we should stop using the word 'camping' as it's meaning in terms of a game exploit is meaningless in the ArmA world. Someone who 'camps' is just a enemy who needs to be overcome.
As I said - maybe I am being naive (feel free to criticise my outlook on this issue), but if we really want an immersive world in ArmA2 we shouldn't be thinking in terms of 'game exploits' but rather about how to overcome 'tactical disadvantages'...
I simply perceive the 'camper' as someone who has identified a tactical advantage. Good on him --- go kill him!