Max_cady, this report is covering a news story on the resale of AutoCAD, in which (as Orta already pointed out) the end user who is using the software does not actually own the software for himself; he is merely licensing it from Autodesk.
Video games are different because, while you are indeed buying a mere licensed copy of a company's game, there is not usually an end user license agreement that player has to sign or agree to. You typically won't find any fine print saying that the owner cannot pass on ownership of the copy to someone else, either.
If the games industry were now to challenge the sale of used video games, the courts may rule that copies of games, like copies of movies, are perfectly fine to resell.