>he has to pay any doctor with a 15€ surplus

Which is less than the co-pay you pay on good US insurance.

>I pay my best engineer 60k€

Why don't you pay them more?

Is that not relative? You could also ask Meta why they don't pay all the top engineers 100 times more. And the reason in both cases would be the same, it's not sustainable for the business. I often find Americans on here judging salaries from the point of view of an American economy which to me makes no sense. You can't expect an economy 100 times smaller than yours to pay its workers the same salary that you pay yours.