Bungie has been pushing their relationship with Sony hardcore. At the PS4 announcement, there was a Destiny video and even at Sony's E3 there was more information and a full length gameplay reveal. They've even said that the PlayStation platforms are going to receive exclusive content.
Don't get me wrong, I think it's great that now more people will be able to enjoy Bungie's creations, but the Xbox fanbase are the people who have supported and loved Bungie's games for over a decade, the one that's bought all of their games and merchandise. I don't understand why they being so cold to Xbox and it's fanbase?
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As many have said its because they need exposure to the PS crowd. They are a big name for Xbox but they do need to build reputation in order to have a good showing upon release. Us Xbox owners see Bungie on something and jump in line. Not so with the PS.