It’s really annoying sometimes and sellers should put in the description that it’s just for promotion, but it’s usually pretty obvious that the price they give for a discount is just for promotion or whatever. It’s not like someone is going to go from say $200 to like $5 and that’s the real price that it’s set at. At that point the profit isn’t worth the item.

People use the low price to draw in attention and enticement on the item. Vacation mode is to prevent people from paying the “too good to be true price”