They also arguably make people hoard less. If you can't resell for a large profit, there's no point in buying more than what you feel hedges your risk. So you'll buy 200 masks instead of 20 000.

Disposable PPE is also funny in a way that it makes no sense to buy it unless you buy in bulk. If you can get 200 N95 masks for $20, it's OK. If you can buy 2 masks for $20, then you'd better spend $1000 or don't buy at all. A lot of people buying few masks each just wastes a whole supply of masks that could all go to one place (e.g. a hospital) where they would make a difference because there would be enough of them to be used properly.