I may be an idiot - wouldn’t it be cheaper to get rid of the 20% coupon code? And if the retailer REALLY wants to keep the 20% discount for a particular use-ca

I may be an idiot - wouldn’t it be cheaper to get rid of the 20% coupon code? And if the retailer REALLY wants to keep the 20% discount for a particular use-case, make it a targeted discount for certain user accounts?