At coffeehouses here they usually have a large jar on the countertop for people to leave tips for baristas. Still, I notice a lot of people leaving nothing in the jar. I think how you treat a "server" says a lot about your personality. If the “server” is behind a counter and you don’t have to have extensive time contact with them (as opposed to, say, a waiter/waitress), it’s easy for some people to just walk away and not tip.
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