I’d have to say its mainly a battle of generations. The older generation who bought the mugs when they were “Guaranteed Refills for Life” continue to reuse them o trips, whereas newer generations saw it as one and done for a single trip.
Last I heard they were going to implement an (RFID?) chip into the mugs for single trip use. The case of cost is quite obvious though. I’d simply buy the mug for coffee (Since I don’t do soda) each morning at the resort, or fill it up before a trip somewhere.
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