In Australia, the last time I looked, around 90% of the lifetime medical expenses is spent on the last year of life. This has been true for decades.
You think you are doing good stuff, but all too many suffer and die. As a GP, my role is to keep folk alive. If I was a complete rationalist, I would work out some way of stopping useless treatments, but unfortunately that is usually only obvious in retrospect.
I counsel folk on the pros & cons of cancer treatments.
Sometimes it is obvious you are flogging a dead horse, and really they should pull out and enjoy their last days in comparative health, without the misery of chemotherapy et al, with the horrible side effects, and before you recover, the cancer catches up to you & you die in continued misery. I kept one of my mates out of lung cancer chemotherapy (in this case there really was no chance), and he enjoyed his last few good months without being stuffed by chemo. His family still thank me years later.
Then there are the less obvious cases, where the therapy may help, but usually just adds to life's burden of misery, worst just before they die.
Then there are the successes. They are wonderful, but not that common.
Sure, some guys making chemo drugs make a lot of dollars, but what drives most medicos is that we care, and we are not very good at pulling back when things are hopeless, because sometimes we succeed.