I've thought about the ibpro arcade games, but if you visit
www.v3arcade.com, they advise that unless a game becomes available on v3arcade.com, then it should be considered illegal. Maybe the game designers have only given permission for their games to be used on ibpro arcade, I don't know...
And I operate a legit(ish) business which is doing quite well, so i don't want any legal eagles trying to take down my empire!