Because of a lame reason.
Yet another scalper has canceled my 2021 McDonald's Pokemon Trading Card Game 25th Anniversary purchase on a popular auction website.
These are the worst kind of people. They buy out items that's in demand, and cancel orders if they don't make a huge profit.
Some of these scalpers will even relist the items they claimed is "out of stock" or "damaged" right after they canceled your order.
If you cancel your buyers order for no good reason you could potentially drive customers away from the platform -- that many other sellers relies on.
Disclaimer: My experience with this popular auction website does not represent what you may experience.