I have never 'done it' cause I personally do not enjoy that age group and am usually happy to see them heading off to full day school and fly the nest so to speak .... but if I WERE to do it if the right family came alone that I could manage working with that age group and not want to hang myself at the end of the day ~ than full fees would be the only way I would consider it for all the reasons you have stated ~ the child is taking up a full time space specially if they want or need PD care, March break and summer care as well ad well for ME the age group is a PITA with the attitude and stages of pushing for autonomy (aka I know more about the world than you do) and bullying (do what I want or I wont be your friend) and all the other stuff they go through during those charming years and I would want to be well compensated for having to work with that age group daily