on the side of pvp i think that when a pk player kills someone they should have a specified amount of time where if they die they lose stats.  This would raise the risk factor for pking, but the reward factor would have to be that the player they kill lose some items.   The risk/reward ratio would have to be set for pking, otherwise to be a pk would be quite dumb...  i know that if i had a 100% chance to kill someone and later die and loose stats without the possibility to gain something from it i would not even try.... so if pking is put in the game a Risk/Reward ratio would have to be included.