I don't hold spot without pay. If I have opening, and someone want it, they pay for it from time it is available. Don't want to pay, then next person will.
My next vacancy will be September 2015 when oldest child go to school. I filled that place in November 2014 and person not need care until November 2015 but they know once boy leave for school and place is empty, they have to pay full rate for it for rest of September, all October until the start date. If they didn't agree to that they would not get place.