Well in most cases losing one of two incomes in the household costs a lot more. In the US, anyway, it is a lot more common to have a stay-at-home mom in the upper incomes; the working class is mostly every-adult-must-get-a-job (or two or three). Occasionally there are grandparents available, but in some cases they're in another town, and in some cases they are deceased. Summer "camps" are definitely not a rich thing (in the US, anyway).