Ever since the break up of bungie and 343(halo) bungie has favored playstation. And even if they are "mad" at Microsoft for any reason it isnt really pair to punish the players in any way or form. And to be honest xbox players kinda made bungie the huge company it is today, so why do they have to favor ps3/4? What i mean by "favor" is that in the Playstation version of Destiny theres many more guns/amour sets to get not to mention more DLC.
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Shit loads of money is your answer. Bungie= Mercenaries -blam!- the fans, plus Halo may have made Bungie big but they -blam!-ed over the Mac fans first. They do this all the time.