Well RDR is a different story. There's no reason to think PC gamers would give a damn about RDR. But GTA was a PC game, and at this late in the series, it's not like they couldn't preplan it so they could make some PC gamer money, fucking quickly. It's not like they have the misconception that it wouldn't sell really well. So there has to be a point beyond 'circumstance' or, 'its too hard to port to PC'.