No more than when buying a seat on a flight at a discount a month ahead vs. buying one a day ahead and paying full price, or buying ground shipping for a lower price than next day or two day delivery.  Particularly applicable in 2021 is that the sooner you want it, the more it will cost.  
So I ordered a new laptop during the Black Friday in July (July 11) promo and got an extra 10% off. Great deal, right. At the time the estimated delivery date was August 16.  “Fine” I thought. It’s COVID, maybe everything takes a while. But then I was browsing the site a week later, after the promo, and the arrival date for my exact build was down to July 23rd  In my order status the est. delivery date hadn’t changed.  I contacted sales support to see if my laptop would be arriving early and was told that the dates in my order status were still accurate. I pressed further with sales support and was told essentially that because of the discount, my order would take longer than orders placed after mine. I was annoyed at that. Should I be?  
Why are shipping dates now earlier than when I ordered?