I have yet to advertise; but you certainly could set up your ad to appeal to teachers (no fee for summers off etc.)
I am at the mid-high range for my town & I budget accordingly...with classroom sets ups/year end it's usually about 5/6 weeks off in the summer (not whole 2 months of summer).
Drop off & pick up times are awesome; my first drop is @ 7:30/pick ups by 4/4:15.