I already covered how used cars and used videogames aren't at all comparable on page 1. But I can give you an extremely long list of reasons why I'd rather have a new car than a used one. If you can give me a single reason why a new game is better than a used one I'll give you a cookie.
The simple fact that Jerykk, Verno and I all seem to be in a somewhat generalized form of agreement on some of this should speak volumes.