Why not charge a non-resident hunter 2 or 3 times more for his second elk tag?

Non-resident hunters that buy a second elk tag typically are good enough hunters to fill it. This means that during bow season they may harvest two mature bulls. As a resident my cost for a second elk tag goes up by a factor of 13.5. It would seem only fair to: (1) charge a non-resident 2 or 3 times the cost of the first tag for the second elk tag or (2) limit his second kill to a cow if there was no price increase. I don't believe other states even allow a non-resident to shot a second elk and their non-resident fees for the first tag are typically higher than Idaho.