The problem is, that to people who mainly play PvP, any PvE activity, any gun acquired in them, has just become pointless. Why would a PvP player do the raid, if he knows that the weapon is going to be useless in his main activity? How would a PvE player ever match up to a PvP player in, say Trials, as the PvP player is going to have plenty of PvP acquired guns, whereas the PvE player would mostly have PvE guns, which you just made useless in PvP, thus giving PvP players a huge edge. And the list goes on. Edit: And let's think about how much of a shitshow ironbanner would be, as PvE players flood into PvP once a month, just to be slaughtered by PvP players.