Bob,
Computer games are rarely done in a cafe/game room basis. We do this type of gaming on a limited basis (only because we have nothing else to do with the space) with console systems. You will only pull in the youngest customers as the older customers already have their systems at home with nice tvs.
Arcade: Costly to buy. Revenue share? seems to be not many of these folks out there supply this way.
Cafe: While equipment is cheap these days, why will people come to you?
Neither of these ideas are terribly exciting to me.