I found
this article about the choices doctors make in their own healthcare at the end of their lives to be a very fascinating read.
In a nutshell, doctors understand the treatment options available and realize when treatment is futile, so they tend not to opt for anything aggressive or heroic, even though they can afford it. They tend to only get treatments that will work.
The result for them is that they have a better quality of life at the end and live about as long as others do. And there is a lot less cost associated with their deaths. Interesting read.