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by ghaff 813 days ago
One answer is: It's just annoying. I normally use a credit card. Yes, I can use my debit card and enter a PIN. If it's a discount specifically for cash, I may not have any on me and don't want the change anyway. In any case, it's adding mental overhead to just paying.

(It's usually more like 3% delta which I almost get in cashback anyway but still annoying.)