the degree is difficult because everyone wants to do that job, not because it’s difficult per se

Pretty much says everything about why your wrong on this. Being a doctor is hard. There are far easier career and business if profit is the motive.

Beyond that are doctors that rich? They are wealthy, but the Zucc ain’t no MD. Neither is Warren Buffet.

My point is that someone motivated by money will drop out of the MD path. Being a doctor is a career of passion that also happens to pay well.

Engineer is similar. Take some differential equations or read Jackson EM. There are easier things to do for money.

I know someone who make similar to a doctor with a seafood restaurant. Particularly when you consider fewer hours.