Without question, not everyone should start a business. That wasn't the point of the article. It's about the advice you get and how they themselves not follow that same advice.
As the author of this article, this isn't true. some comes from the merchant fees, many comes from the fact people don't pay off their cards every month and that far more subsidizes those payouts.
Lastly have you tried paying with cash online? While Bitcoin is a neat idea we are far from yet mass acceptance of any digital currency yet.