Seems pretty clear that it was worth it. The actual bill was closer to $250,000 -- $618,000 was without any discounts.
We work and save and pay premiums for decades specifically so that we CAN have someone pay $250,000 to extend our lives by 17 months. That is the PURPOSE of a health insurance policy.
It's hard to see this one as an example of our (admittedly terrible) healthcare costs.