Wow! I just took a closer look at those photos you posted. I see at least 6 computers, name brand cereal which also involves milk, well dressed kids, huge house, etc. These people have money. They can certainly afford 15 children if they can afford two-plus gallons of milk a day. We don't even buy milk in gallons anymore, it comes in powder form LOL.
People always ask me: "How do you do it?" I like to tell them we simply buy bigger pots and pans.