I wonder if those "coupon nazis" ever wind up on episodes of Hoarders.
I've seen them where I work with their binders of coupons. Then they wonder why the shelves are bare. Then they get annoyed when I tell them that other couponers beat them to that item.
Never mind that where I work, if you have a coupon whose value is greater than the price of the item you are buying, you get the difference in cash or as a credit to the rest of your bill.
Working in retail has caused me to hate couponers. I know they save money, though if you're buying an item you don't usually use just because you have a coupon, you're not saving money. I'll use coupons for stuff I usually buy because that does save me money. I also don't buy 10 of the same item. Usually only one or two is enough, unless for whatever reason I'm buying cans of wet cat food, though usually I buy the variety pack.