Why would you go into medicine when you can make millions working for youself

A number of students have asked me about going into medicine. My answers is usually that you have to really want it. Don't get me wrong, I love my job, but the road is long and hard. Unlike many years ago, the respect, autonomy, income, and security is no longer what it was. So, why go into it. I cam across this article in the New York Times on Sunday. Now, it does talk about lawyers, but I still think it is an interesting article.