You're forgetting about the third class of person, who thinks it's not worth their time, and, frankly, distasteful to spend that much time and effort optimizing, but also finds the offers presented to those that aren't optimizing insultingly poor value.

That's the kind of person that will not download the app to get the coupons and hunt for the good deals at Safeway, but will also not accept the exceptionally high sticker price, and instead will go shop at another store.