Parent is right. "Discount buyers" are their own camp, and aren't buying on price, objectively—they're buying on perceived savings. Note that I say _perceived_.
If you had a group of discount buyers shopping for chips, and split it in two groups …
- Group A sees a bag of chips marked down from $5 to $3
- Group B sees the same bag of chips for $3 as "retail price"
… you can expect to see more chip sales coming from Group A. Heck, you'd expect A to beat B even if the discounted price was _higher_ than the retail price.
Now throw "limited time offer" or "first 50 people" in to the mix and watch them fly off the shelves …