Just a suggestion. I think one of the reason that ppl dont wanna pvp is that you have to pay for supplies and gain nothing from PVP.
I still remember several years ago, server had problem that all your items will be restored after you change the map. I still remember that day PVP was crazy, everyone was in PVP and trying to smash everything.
So maybe IRO could add this to PVP map, all your items after you quit pvp map will be the same as the moment you enter the pvp map?