Certain electronics retailers such as Apple and Sony offer engraving for laptops, cameras and MP3 players. It may seem like a nice service, but it really saves them lots of money. Why? Engraved products can’t be returned just because you couldn’t figure out how to use the product or because you realized that you spent too much on it and now have to eat peanut butter and corn tortilla sandwiches for a month to avoid defaulting on your student loan.