Because, If you don't work, YOU DON'T EAT!
Our economy is run by the people and for the people. People are paid based on their jobs and salary. With that money, they can buy anything they want! The same thing applies to selling.
Why Capitalism Works
Cons? What are those?
Your work ethic takes you every where in this economy. Some people say that this economy makes a huge gap between the rich and the poor but the reality is that if you work hard you can be rich as well. That and a small loan of a million dollars.