Put up a bunch of those electronic slots on a corner of the wall that say amusement only no cash
Come down to Miami and you will see all these little Bodegas making money, selling cuban coffee and stuff through the window,groceries,nicknacks,etc.. some have the "Amusement only slots" etc..
Or come to NYC. The markup on the stuff at the corner non-chain grocery store is ridiculous and they are always packed. 'Course the rent is insane as well.