I want PS to stay friendly.  It is more than just a hack and slash game, but at this point in time when I have a choice to defeat a foe or mine, Killing something is a bit more exciting.  I however I always try not to be an ass.  If I see someone camped at a spawn point I go looking for another, there is always something else to kill.  If someone wants to kill a monster that I\'m killing I usually share it, or leave so that they can get a turn in.  And if I feel that I want to combat a foe (just to try him out) and someone is camped out there I always ask for a turn, and I have yet to be declined.  Courtesy should not be forced but acknowledged in this game, as it can only make the play experience better for everyone.  
Every so often someone will show up usually more powerful than I and they steal my spawn point right out from under me without even asking.  I just shrug it off and leave, there are only a few of these jerks in the game and I choose to not associate myself with them.