Earlier quoted context omitted.
As has been said, road paving is a commodity business, so the reason why this particular road might be that expensive is probably that it's a remote road on difficult terrain. Which raises the question: should this very expensive road, which is primarily used by members of this specific and admittedly wealthy community, be subsidized by the rest of (relatively) poor taxpayers of that state?
Yes. That's called infrastructure. Whenever America has 'subsidized' infrastructure, the nation has seen many fold return. Whether it was rural electrification, or secondary roads, or rural mail delivery, having it a given for everybody means anybody can assume a certain level of service. Commerce thrives on that.
Also, shifting the cost of such roads to everyone encourages even more construction in remote areas, which doesn't seem like a good thing to promote...