> If you were going to buy 1 of X normally if you think X may be out for sometime you may end up buying 2-4 of X which will run the shelves out very quickly when 10-15% of purchasers do that unexpectedly.

There are enough people who buy 0 of X normally, but if they think there might be stockouts, will visit every store in their area and buy 100 of X so they can scalp them and make a buck off their neighbors.