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Easy solution: Charge for cups.

Put the price of a cup on the board. And watch how many people start to use their own resuable glass / plastic cup each day. I'd spitball it at 35% after 6 months. Especially considering the amount of SB's customers who are routine.

Retrofit the coffee spout with meters to track flow, like a gas station, and charge by volume (and adjust for flavor options).