No he tries to cheat the devil
not be greedy
If you are talking about his soul becoming the property of the Devil - then yes. He made a contract with the Devil and the Devil fulfilled his part.
being a slave trader.
http://www.google.com/search?rlz=1C1CHMY_enUS332US332&sourceid=chrome&ie=UTF-8&q=In+the+devil+and+tom+walker+what+is+offered%3F. Skim through there and maybe you will find your answer :)...