Because I really do not want to buy a xbox one. I have a dream where I one day can play all the Halo games, from Reach, CE, 2, ODST, back to 2, 3, 4, 5 and finally 6. Last console I bought was the Xbox 360 and it's fried. I have yet to play Halo 4 :S
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I would love if we could at least get all the Bungie made Halo's at one point on PC, but it isn't going to happen, especially since Master Chief Collection was just released. And Microsoft needs Halo to push Xbox One sales up right now.