Only games in public places are allowed in the database. If I'm in town for a few days and want to play a quick game of Ms. Pac-Man, finding out that your pal Todd has a machine in his basement doesn't do me much good.
By the same token, a game must work to be included. If the Professor Pac-Man at your favorite pizza joint has a famliy of squirrels living in the coin box, I don't want to know about it. The health department might, though.