It's pretty simple for you to get a good income "you must be a producer and not just a consumer" I believe this rule is what must people who are entrepreneurs live by, hence must salary earners at some point after accumulating enough savings they result into owning a business but perhaps it's not compulsory to own a business.

Some people who owned business still remain poor so it's not a guarantee that you will be successful (what you call "rich"). If one earns a good or significant amount of money and do not want to own a business investing in others business could still make you a very good return, perhaps being a shareholder is quite a good way to earn as much as the entrepreneurs.