I think she's making unwise business decisions, especially in her treatment of her best customers. If she's a good, loyal customer, I would honor the coupon eve

I think she's making unwise business decisions, especially in her treatment of her best customers. If she's a good, loyal customer, I would honor the coupon even if it's expired. She's trying to alienate exactly the wrong people. Loyal customers, you're special--we don't this for everyone because we like you. She could even still invalidate the coupon, but say, because I value your business (and return customers are the lifelines of restaurants), I'll take $12 off the bill, just for you. The Groupon is still expired, customer receives discount and is happy, and business enjoys continued business from loyal customer, and perhaps even a customer's obligation to bring more business to the coffee shop. To outright deny the coupon or some other good-will gesture just seems bizarre. If someone is spending on average $8 and shows up 10 times a month, why risk a $1000 in business for a $12 coupon?