Some people want it. I worked in retail at a place that advertised “every day low prices.” This meant that if an item was marked as such, it was never going to go on sale. Very often it was the cheapest you could find the item anywhere.
I had people put the item in their cart, ask me if it was on sale, I told them the above, and they put it back. Nearly every time.
Hell JC Penny almost went bankrupt when they stopped deceptive pricing.