if there are 100s of km with no-one else around why does it matter if someone is speeding?
and, by cost effective, I was wondering about the cost of maintaining the aircraft, pilot etc against the revenue it generates
Because it's against the law, because there are other drivers on the road who might be endangered, because in some areas you could end up smashing into something like a moose (which can kill you even at much lower speeds), in the winter, road conditions aren't optimal, etc.
I can see how the "points" part of the original title could be turned into a full stop, but how the "speeding" part ended up in a Sanatorium sentence, I don't know.