They couldn't have done that in five years? And I mean, GTA IV was a sloppy POS when it was released on PC. A year of patches made it playable. When GTA V comes out it really does have a lot to answer for.Extra features and more optimization time with the PC version?
That's what I would think.
My real answer is exclusive moneyhatting, as there is no other reasonable explanation for a lack of PC port at this moment in time. It'll happen though, I'm not too miffed.