The main purpose of the text is to show that college dropouts are not successful because they are college dropouts.
Explanation:
The myth of the college dropout is a text on the well established myths around college dropouts who became really successful in life and busts the myth that somehow being a dropout can help you get success.
This is argued as the people who drop out and became successful were simply in such a position that they did not have to be in college to be successful anymore and could just start their ventures when they wanted to.
