I actually asked a few people today at college.
The main answer that kept popping up was actually Freedom,
meaning being able to shoot people, steal cars, running down pedestrians without any of the real consequences at all.
I mean, when i walk outside i don't see psychotic maniacs driving down the road hitting every street light in view,
destroying the car, stealing a slightly better car and then going back on their murderous rampage, seriously... O.o