Add-On Sale

You've added on stuff to your purchase. You went to The Gap to buy jeans, a t-shirt, and a super-wide summer hat with a pink flower on it. And yes, your days as an offensive line coach in the NFL are numbered. But the salesgirl was lovely, and she convinced you that the yellow Bermuda shorts fit your fire hydrant legs just fine. She also upsold you on the rich Corinthian leather man bag, and a comb. Which was impressive, because you're bald.

Add-on sales aren't just merch. The highest margin add-on sales are things like buyer's insurance and upgraded warranties that almost never get cashed in, so the margin kisses 100% to the issuer, and thus rationalizes huge commissions for the salespeople hawking them.