It's not that no one buys certain products, it's that the stores know who buys what and sends targeted advertising and coupons based on that. If they know you b

It's not that no one buys certain products, it's that the stores know who buys what and sends targeted advertising and coupons based on that. If they know you buy dog food, they can send you a coupon for a certain brand that isn't selling well and they're overstocked on. You're manipulated into buying things you otherwise wouldn't have just like advertising on the web.