As I said before, the best way to earn money is to be completely
evil.  This one is very evil as well.  First marry the mayors
daughter (any town) then lead him out in the woods and murder
him.  Since the rules apply that the closely related male would be
mayor you are now the mayor!!!! and most likely your rich!! 
NOTE: If you don't understand how your the closest male to the
family it's easy.  Your the husband of the daughter if the mayor
had a son then he would be the mayor.  So it is especially
important that you eliminate them as well as the mayor.( I don't
mean to be this evil because im going to be more good than evil in
the game.....or am I.)