The pizza scene

Something always bothered me. They are leaving for France the next day and make a point to not have leftovers or food that can spoil. However why would they order 10 pizzas? There are fifteen people in the house and ten pizzas is 80 slices. That is an average of slightly over 5 slices per person. Seems a bit much or am I missing something

Ive eaten so much liver, i can only make love if im smothered in bacon and onions