I don't have any problems getting teachers to pay this. Most know that they will more then likely have to pay for the summer if they want the same provider the next school year. I have spoken to many providers through out my city and this method seems to be the norm here. It might not work everywhere.
You do get some teachers who are cheap and don't want to pay for anything they don't feel like they need to. but that can be said about some families in general.