Upon much thought of this subject by both me and my friend, we concluded that there is a way to sell your "soul" to the "devil"
though, it may not be like what appears to be in the movies and books, there is no mystical creature that comes out with a contract you sign with your blood. In this case selling the soul to the devil is your morals.
People who would do anything to get on top and crush the lives of others, and have any material object one might want without regards for others is infact soul less.
the devil is supposed to be the creator of chaos, the thing on your sholder that tells you to go agenst what you believe in and take something anyway. and you sell your soul everytime you screw someone over for your personal gain.
think about it
*may have more to come*