I know people that have tried this and from a home based sense it didn't work very well. The older children often had a younger sibling which would have meant two programs. Older kids were started in a home as infants and just stayed there till school age. Also if a parent is considering a preschool program they are generally thinking of a daycare centre or specialized program like Montessori. Not saying it won't work but you would certainly have a lot of planning to do to make it sustainable.