Knowledge raises the possibility you have of making more money, but that is not the only decisive factor. Many wealthy people have made huge money without knowledge, but through cleverness, influent contacts and sometimes cheating. There are many uneducated people being successful as virtual coaches, retail sellers, businessmen, entrepreneurs and also some without much formal education, but that still occupy important and rewarding spots on private and public sectors. So the logic of life works in many different directions and we can't really understand it on its totality.
No matter how much knowledge you get and no matter how high the degree you have achieved in college. it will not guarantee you success only increase your chances of being successful.
And it's true that there are some people who are successful in their field without going through college, they only rely on experience while working/doing business and have more courage even without knowing the theory. they can have more courage because they are used to the field.
meanwhile there are some people who have graduated from college but are unable to achieve success. this is because the person does not have the courage to jump straight into the field even though he already knows the theory because there are still doubts in him.
So logically, knowledge is not enough to achieve success, but you must have the will and courage to start something with the knowledge you have to achieve success.