Neglecting to leave a monetary tip for high-quality service after expressing effusive praise or gratitude to the provider.
Endemic to service-intensive but low-paying industries, such as salons, health spas, and restaurants, where wages are significantly reduced because of the expectation that customers will tip employees.
Waiter #1: "That couple went on and on about how good the food was, and they said they loved my service! I can't believe they only left a verbal tip."
Waiter #2: "Yeah. Gratitude is nice, but it doesn't pay the electric bill."