The bottom line is that one person can only make so much money. We only have a finite amount of time, capital, resources and ideas. However, by leveraging the skills and capabilities of others the potential for growth is virtually limitless. Thus, the key is to create a business that does not require your continuous care in order to make money.
That is the short answer to how to become rich. However, building a scalable business is not necessarily easy. It require time, effort and a whole lot of creativity.