First of all and you can check on google maps the distance as the crow flies is 7 kms not 15, 14kms for a round trip. And when you are calculate your fuel usage for trip in your car, do you add ownership and maintenance costs for your car to those trips?
Aviation on a personal basis is expensive because of all the added taxes, airport fees, ground handling, logistics so on and so forth, actual fuel usage is not very expensive, specially on a small to medium sized helicopters. Which is what only the govt has to pay or consider in this case. As mentioned earlier the choppers are already there, whether being used or not.
Check out these people they flew around the world in a R44 and if you watch the entire series you will realise its not too expensive
Also these guys flew around the world in a small single prop plane, watch the whole series also to get an idea outside of buying the aircraft its not too expensive.