Owning a business comes with many benefits such as financial Benefits cos your income won't be like a regular monthly salary, the more successful your business the more you earn.
You will have money coming in every day that helps you cover day-to-day expenses instead of waiting for a monthly salary before you can cover those expenses.
Owning and earning from a business should be like a second source of income and not your main source of income, so you should also consider that a business is risky and should be taking with many cautions before fully venturing into it. Every business have their ups and downs and when you decide to be very careful in it and play the rules of it, it will indeed make you a lot of money that can be used in conjunction to your main salary. The type of money you envision should be limited for a start and wait as your business grows bigger to envision more. Just like you said, the more successful your business is, the more you get to earn.