There's also the fact that you can't just buy enough to make one hamburger and some fries. At a minimum, you can buy enough to make 2-3 hamburgers (and you'll h

There's also the fact that you can't just buy enough to make one hamburger and some fries. At a minimum, you can buy enough to make 2-3 hamburgers (and you'll have leftover buns, cheese, etc). So now you have to store that extra stuff (more sq footage and refrigeration costs). You might not eat it all (and it goes bad, meaning you throw it away). Or you might freeze it for later (maybe - some things you can't freeze of course).