But isn't this exactly the problem in the model?
Most people can't afford the high risk expensive treatments so you are basically just bankrupting them.
The expensive treatment is the treatment that we "really" need, but also that which is without reach for most of us.
By keeping the expensive treatment in the public domain as long as the private sector hasn't found a way to commodify it. So that people in general have access to it, seems to be a fair way of doing it.
If only the rich can afford treatments that are expensive you could might as well keep the old system.