You're talking about day 1 sales.
Majority was preorder. I know because I actually followed the damn launch on any site and feed that covered it. It was hell for anyone that didn't have a preorder. In fact, the majority of bitching I found was people bitching about how they didn't pre order and how they couldn't get it.
Your local stores don't mean anything. This was plastered over every single site, it even got so bad some police forces declared it a big deal and put officers in stores with high populations. All of them preorder. Hell, there was even an instance involving a pair of policemen using their power to get to the front. With a preorder.
Day 1 sales, and majority was preorder. You'd be hard pressed to get it on day 1 without a preorder. You may have not have seen the shit storm at midnight, but I did. I made it a point to stay up and watch people try to get it all at once and watch all the drama. And yes, it was worth it.
Expecting GTA V to not be mass preordered and grabbed on day 1 is fantasy. There is very little difference between the sold into retail and the sold to consumer margins because everyone grabbed it up first chance they got.
Everyone grabbed up all the copies en masse. There is little difference between sold into retail and sold to customers due to high demand.
Oh and 1 billion dollars isn't a record in itself. GTA V only sold it FAST, not MOST SOLD. There is a difference that people don't recognize.