You make a good point. Insurance companies aren’t actually that profitable margin wise. They just are so massive that their 5-6% margins add up to huge numbers.
Saying they are unnecessary would be a misunderstanding of our current system. But to say our current system can be altered to render insurance as we know it today unnecessary is a different thing.
If that is the case, thr only way you can increase profits is to be ok with ridiculous pricing you keep getting...
My personal anectode is a genetic tests done for pregnant ladies. Natera, iirc, charged something like 8k$. I asked for cash price they said 230$. Go figure