..."in the USA". At a guess, I'd say it's the complete opposite in Europe with it's pesky human healthcare systems.
How many European doctors make more than $500k / year ? The average orthopedic makes roughly that (https://www.kaptest.com/study/mcat/doctor-salaries-by-specia...)
It's cheaper, but that has its price too.
To be fair. That's true of educated people in general, not just doctors.
Nowadays, older doctors (those who have served their 10 years) are moving from insurance-based to cash-based treatment because they demand much more than the "pricing tables" dictate - so there's a lot of doctors around you, but you can't go to them because the "public" insurance can be used only where they accept it, they never give you cash. The prices are very similar to US hospital quotes - in absolutes, not PPP. Meanwhile, we still have the "public" healthcare providers (these are corporations, but usually wholly or partially owned by political entities), but the quality is getting worse, they are unable to keep it stable, much less improve - not surprising since they rely on essentially forced labor.
I suspect scale may be a factor here.
This is the exact same issue vets face when they perform surgery on your cat, and it's the exact same issue that surgeons face when they perform surgery on you. The difference is that vets don't have to pay tons of money for malpractice insurance in case they get sued by the owner, which is one of the big reasons why veterinary surgery is so much cheaper (i.e. affordable to ordinary people) than human surgery.