I am not asserting that it applies in the above instance, but...

In broader medicine, one basis that can lead to the above sort of dynamic is compassionate protocol ("we are losing a little money on this deal, but you are in-need and we're here to help everyone"), as opposed to greed protocol ("we medicos are here for the big insurance money, and only charge the True Low Cost when forced").

And on balance, the nature of the people who choose the occupation of medicine tends towards the former.