One day I was standing in queue at Costco for checkout, a man who was standing in front of me had tons of ton items to checkout. I thought i might have to spent another hour or so to check out after him. He placed all items on checkout belt. As soon as, sales clerk started checking the items, he pulled a coupon from his wallet. The sales clerk refused to take any coupon as it was expired the day before and he also refused to buy any item, which are not covered by coupon. Finally, you won't believe, he ended up buying a banana bunch for $0.99. Ohh...gosh...why some one spent 1-2 hours for shopping and finally checking out $0.99, that too because of coupons?.
But my believe is, this coupons are free ticket for shopping, even though you don't want to buy anything, you will buy something, just because you have a coupon.