I wanted to emphasis this for the following reasons:
First, you create your own idea by studying other ideas. By investigating other successful ideas, you might shape your own philosophy to a different form; you might get a completely different idea than the previous one you had. Overall, you may get new ideas by studying the existing ideas.
Second, you can possibly find your role model; someone that worked hard, someone that never gave up, or someone that changed his hobby into a business.
Third, you may understand how easy it is to become a millionaire by studying others. If you knew nothing, you may think becoming a millionaire is close to impossible. Now that you have studied a case, you may find that some idea that was in your head before will make you a millionaire in no time (though I guess time does differ for everyone).