These are showing up more and more at Cafes and grocery stores. I have no problem dropping change in a can when i buy a cup of coffee but having the barista turn the screen around and stare at you is fucking weird.
yeah i'm certainly not tipping a coffee shop barista for pulling a knob to put drip coffee into a paper cup for me, but if somebody is hand tamping espresso and pulling shots for me then yeah they're gonna get something.