Lol, Nat is a nubcaek, those were either extra copies or purchased directly off the store(your garrysmod), that I know of you cannot sell your games to others, just think, you get hacked, hacker gives your games to himself, although if this were possible hackers would cause valve to have a profit increase from all the people who get phished by steam gold or nvidiafreegifts. They would want to buy new copies of the games. $$$