Having been on both sides of the fence (I was an ECE in the full day kindergarten) I understand the difficulty of having to pay for time not used; however, I valued my provider and made sure that she was paid for the entire year-- and let's just take look at the reality of a teacher's income...
Teachers makes about 3 times what we make in a year. They are salaried over 10 months with a portion reserved to cover their summers. I believe that some even collected EI (although I believe that has or is being changed). Teachers are also paid for Christmas and March Break - could you imagine their union's outcry if they weren't?
I personally charge teachers the same as my other families for Sept - Jun and then offer them 50% off for the summer - which works out to be 2 week paid in July and 2 weeks paid in August. The teachers are welcomed to use the time they've paid for - except for the one week which is my vacation time.
I'm sorry if I seem annoyed by this, but really, teachers need to start showing their providers a little more respect!