To my understanding talking to the ladies at the child-care center's. The center is required to not exceed x number of children per day/per hour. They can only hire people with the clearance to supervise children after getting their Certificate 3 in child care. Then the staff need to under-go skills/training on their time to improve working with children.
Then you have insurance for the workers, building and also the necessary security and fire drills to be conducted regularly and kept up-to-date.
You have over-time pay, inclusive of when parents are late to pick up the children from day care.