If you are working as Advertising Professionals, Sales executives, Marketing Executives, IT Professional,Business Developer or Managers or student of BBA, BCA, MBA, B.Tech, even if you are Simple Graduate, you must do this course and can get maximum benefits of Internet. If you are spending some time on Internet just for checking the Email's or chat on facebook, gmail. Spending some hours on internet you can work for yourself or other's website also. Those who want to start own business, not only in india, you can work for overseas product, we will guide you how to get orders from specific country. In this way you can earn in dollars, Pounds, Euro's.
You said above is also right but I think anyone can do internet marketing by giving only few examples you are making restriction to other fields just like commerce, arts, or 12th pass can do Internet marketing.