My sister is training to be a doctor and she has come to dislike the heavily regulated environment we have here in which doctors are not allowed to do anything of this sort. Now, they also don't usually need to, which is a good think, but after she returned from a year in South America, she misses the on-your-feet thinking, creativity and flexibility she could and had to employ to give her patients the care they needed.
I can imagine pulling this off is a great source of satisfaction and validation.