What do you imagine is the profit margin of a health insurance company?
According to this report by the national association of state regulators, the profit margin of the health insurance industry in 2023 was 3%, or $25 billion.
Compared to over $1T of premiums, and over $4T of total healthcare spending in the US, that doesn't seem "staggering" to me.
https://content.naic.org/sites/default/files/topics-industry...