I do not think "ridiculous" means what you think it means. 1) I personally have abandoned checkout carts when I realized they offered big discounts and I didn'

I do not think "ridiculous" means what you think it means. 1) I personally have abandoned checkout carts when I realized they offered big discounts and I didn't have one right then. 2) Alternatively, the coupon code box has very often reminded me to go find a coupon - and pay less than I was already willing to pay. My behavior is normal human behavior. You can debate whether (1) is "logical," but the checkout process should maximize profit from real human beings, not theoretically logical ones.