LOL, total rip odd, should be more like $600. No one wants a used slow computer for more then a new faster one would cost. Sure you probably know what the new one you want is so you are trying to sell it to some sucker and not have any out of pocket for the new.
What good is it to sell it wil all the games installed, eventually a reformat will be required and the games will be lost forever. So you better get out of your head that it should cost what ever the pc cost plus all the games, unless you sellling the game discs as well.
Oh, and its not an extreme gamer by todays standards.