If you're wealthy maybe you're also savvy enough to deal with the system. When a few second opinions with doctor friends are only a phone call away it's not hard to imagine better outcomes better. I recall an article on HN where a dev quit his job to do cancer research when he was diagnosed, and spent the next year getting to top 1% level in cancer analysis for his subtype. That's disposable income in action.

Fatal opioid use is less common with wealthy folks, and great diet + exercise + friends (easier if you're rich) are all good prevention mechanisms against antibiotic resistant bacteria.