again the comments have gone all over the map
The Wall Street physician article is a joke. It only looks at cost which on an incremental basis are reasonably modeled at $300K. The return however more than compensates for that.
Most highly compensated people work 40-60 hours a week - any successful sales, lawyer, etc. So there is nothing different.
Basically an MD is a slam dunk financially - if however you want to work 30 hours a week and relax, then this is not for you