Heh one of the most noticeable cases of this is when you buy something and unwrap it and find it covered in obvious "shelf marketing" stickers - your TV doesn't need a giant energy star sticker across the corner (and you have to remove it) nor does it need the specs on a little card attached to the base; but they do want those when it is the demo unit on the shelf, and they know that retail won't bother sticking them on, so they put them on every single product.