But that's sort of the point, it matters a great deal. The cheaper price is there specifically as a sort of reward for the buyer to clear out the slot. It doesn't make sense to offer it for those who just pick at the pile for their own convenience. And as long as the price is unit based, as it is on MB, defining that the "whole stack" is "whatever is left" is the most sensible way. So yay, cheaper price for the one who decides that whatever is left in the pile is worth the discount.