The article talks about mainly dentists, and the supporting infrastructure, which may actually be relevant. But we need to see more info here.
Dentists have always been called better businessmen than doctors, and better golfers.
Sort of unrelated, but I know someone (not a Dentist) who does work on
many northern reserves and remote communities, on a contract basis,
for the Federal Gov't.
He pays (out of pocket, up front) all of his expenses for travel and
accomodations and so on and so forth, and then bills out and waits for
cash to come back from the Gov't for his pay. I'm sure his billing reflects
not only his expenses and his pay (for his expertise, & willingness to do
the job and put up with the funding structure), but the fact that he has to
put out the cash for everything up front, & wait to be paid after the fact.
I'm assuming that Dentists flying to these remote places may be facing
the same or similiar realities, and their billing reflects this. I'm also
assuming that it would be easier to stay at home and run their practices,
avoiding the whole travel & wait for $$$ from the gov't eventually thing, so
to attract someone to bother putting up with that hastle, we see larger pay
than would otherwise be seen to just do a job and go home for supper
everynight to their family and their own beds.