Hotdog buns

So you go to the store you buy two packages of hotdogs. Each package contains eight hotdogs. You have a choice of buns a package with twelve hotdogs buns or a package with eight buns. Why do they offer a package with twelve buns? Why would you buy one with twelve buns? Why would they sale only twelve buns. Wouldn't the jumbo package have 16 buns? WHY? Who buys the twelve buns and why? There's either not enough buns or two many depending on how many package of buns you buy? Do they split a package of hot dogs in half and buy 11/2 packages? Can you do that? What do they do with the other 4 hot dogs donate them to the food bank>