Just because they are a charity doesn't mean that they have endless resources. They have to pay suppliers, the people that work there need to be paid.
The reality of medical care is that it will always be rationed, always. There will always be some expensive therapy out there that can be tried, even if it shouldn't be.
My husband used to work at the county hospital in Seattle. People would fly their relatives in from another country and try to get them care there. The hospital struggled some years to care for those who lived in the county.
As a country, we decide who rations the medical care, and right now we are letting the insurance companies do it based on who can afford premiums and how much profit they want to make in the current year.
There will always be tough decisions to make in health care, and there will always be families who cannot let go and think their supreme being will perform a miracle, meanwhile the medical staff is at fault when the miracle doesn't occur and everyone is mad when care costs money.
Our inability to set clear policy as a country and as a society means that the medical staff and those who are trying to keep the hospital afloat will bear the brunt of society's inability to step up on this topic.
Even non-profits cannot operate in the red.