Before using Quaver Music I used two or three children's song books and then set an outline of what I wanted each class to learn throughout the year. It was much more work, and I personally didn't feel it was as effective as using the Quaver curriculum. Not to mention all the time you lose on band prep when writing everything out for elementary.
It's hard for admin to see the value and benefit of a curriculum when in the past it wasn't a cost. They're looking at the numbers, but you have to convince them the benefits outweigh those costs. Lets say you serve 200 students with that material. Do you think people would bat an eye at purchasing textbooks and workbooks for those same students? For only $9.25 cents a student they receive their entire curriculum for the year with quaver. It also saves you time in class prep to focus on your higher level music courses.