Here, we call it before and after care. I think you have a good list of pro's and con's. It is definitely more profitable for a centre to offer this then a home daycare as your ratios are much large.

A couple of thoughts. I wouldn't invest in vans, only do it for schools you can walk to and pick up the kids. The liability is huge as well as the expense. You could also inquire about offering this program at a school where they don't have it but it would be your program running it in their building for their students and you pay a fee to use the space. If you use can do this in a school close to your centre you could split the staffing so that the school aged staff come back to the centre to cover breaks, lunch etc and possibly have one less position at your centre (if that makes sense).