Greetings !

A doctor main aim is the welfare of the people. They are more interested in helping their patients instead of making money. However, some doctors are interested in making money also. It depends on the degree , the experience , the past records that a doctor had whether he is earning a good amount of money or not. Some good doctor charge very less money from the patients and that's why all they might be earning less. It depends on a lot of factor.

Hope this will help you.