They would lose all of thier xbox users if they did that. I want to make things clear with you alright bungie doesn't give two shits for the gamer they won't go out of thier way to make you get your money's worth and the only reason why they won't make this free to ps4 is because it means they lose they're xbox fans (or what's left of them) and they get less money from play station users. Ok and this was cut from the game and it should be free. So bungie is shit company and don't try to defend them in any possible way.