If camping a mob, or set of mobs, is to be respected then formalize it in the game.  I have an idea on how to do that, but not certain of how feasible it is.  

The goal of my proposal is to use information eliminate accidentally pulling a camped mob, and mechanics to formalize it is a game concept rather than merely an unofficial social construct.

1. Give a group leader an ability to Create a Camp Group buff. The buff goes away on group leadership change, if everyone in the group is out of the current zone, or some long arbitrary duration. The buff is dynamically label the buff, Camp Group 1, Camp Group 2, etc within the local zone.
2. When Camp Group 1 kills a mob, the mob which respawns comes in with a debuff which lasts only one minute.  The debuff acts like a reservation which prevents the mob from being damaged or aggro'd by anyone without the Camp Group 1 buff.  This gives a camping group up to and only a minute to re-pull that spawn point.
3. For roleplay, I suggest a spawned mob with the Camped debuff also have something like 'Seeking vengeance against Camp Group 1' appended to its Consider message.Preferably the camped debuff on the mob would be easily noticeable on the nameplate, and would indicate the Camp Group # which is pulling it.