It doesn't have to be every-man for himself it could be alliance based, but the point im making is when you kill the enemy your fighting they drop their armour that they're wearing
Only mmo I know to have done this is runescape (not that good of mmo in my opinion) but one thing they got right was pvp which attracts alot of there fanbase. It is pretty exciting the gamble of winning new gear or losing the gear you have on instead of just grinding for xp or coms in warzones