Not sure if this answers your question, but it seems to me that the beercade/barcade movement seems to do well by offering something that makes them stand out against other bars. There's also the Tilt Ice Cream bars, which is basically again positioning yourself as a location with a unique combination of products. Some of the pinball museums are doing well too. There must be other examples too. I'm actually thinking of starting a series of articles in pinball Magazine about succesful ways to operate pinball in combination with something else to stand out.