I think it has to be clarified that the $24./day number is not just food but amortized total costs. That would include over the years, furniture, bedding, clothing, deductions on dental costs, insurance costs, additional water and power, laundry (a full load of water for ONE pair of jeans), band instrument rental fees, dance fees, sports fees, school fees, swimming lessons, summer camp, library cards, etc., etc., etc. A co-worker just had a $600. weekend for a hockey tournament several hundred miles away. It all adds up - hotels, fuel, food, parking, etc. A few trips like that and the vehicle needs an oil change and service again.
I have no children, but I've been blessed with a step-daughter in my life whom I would die for without hesitation. She is the most perfect thing on earth.