I know some airports have similar Amazon convenience stores. But they're not staffless; there's still at least one person at the exit. Sometimes even another person at the entrance. Yeah it's quick for me since I'm not waiting in a line or being rung up (though I rarely see people in them compared to the traditional convenience stores), but is the company really saving money? Not that I really care if they are or not, but seems pointless if they still have to staff the stores.