That's fine, may or may not be their primary motivation. And no, being a doctor is not a charity, not saying it should be either. However, talking about motivation with you pigeon-holing personal greed is rather dishonest to the doctors who care less about their pay-grade than their patients. What people do in their spare time can influence other things, so that it doesn't concern you means fuck all to the point at hand, if it can fuel something else.
"It was just an example."This is ridiculous.
...I don't think you fully grasp how sample-sizes work.It was just an example. It's not just anecdote, it's a fact.