If a patient breaks a leg and a doctor recommends not experiencing gravity for a while, do we fly them to space?
I am using hyperbole to demonstrate a point: there are meaningful economic limits that must be created by some entity and enforced.
What is the value of a human life? The GDP of a nation is a hard upper limit. The total money a particular person in question has access to is the lower limit.
If you run an insurance company (or you run government run healthcare) you can't avoid answering that question with an actual real dollar amount.
At some point spending money on a person with a particular condition does mean that someone else with a different condition can't have money spent on them.