Because I can wait. I'm up to my eyeballs in video games, and considering I'm the type of person who already throws aside TV and movies in claims that I don't have enough time because all of my freetime is spent watching either Giantbomb Quicklooks, Youtube videos, playing games on my PC (modern gaming), Mac (Haswell), 360 PS3, Vita, 3DS or Android phone.
Since getting a full time job I've had the money to buy both without feeling too burned in my wallet over it, but I realized that there were no games that I really cared about that I couldn't get on PC with my ridiculous Jeff-esqe 2560x1440 monitor.
Battlefield 4? On PC where it belongs.
Watch_Dogs? PC and I'll wait for the reviews.
AC Black Flag? PC if I decide that I want some more AC.
Titan Fall? PC, of course!
Destiny? Dunno, looks like Borderlands to me, and I didn't really care for Borderlands.
I will probably come around by summer 2014, though. Gonna want to play NHL 15 and whatever other interesting crap comes out for it... like Forza 5...