Are you serious? I can remember like it was yesterday walking into either Electronics Boutique in 1999, that was the actual name on the sign then or Babbage's and seeing a CPU v CPU game of NFL2k for the Dreamcast playing. I think you are referring to the actual setup that allows customers to play the games but I am referring to the games that were displayed on in the store. In fact, there used to be a feature in sports games where if no one played the game for sometime, it would actually start a CPU v CPU game automatically.
So the fact that games are made for playing doesn't detract from my point at all, they should still look and play as realistic as possible in a CPU v CPU game.