Exactly. In this situation, the services are needed and they are not being supplied...
Our homeschoolers didn't have a band per se, but they had a small bagpipe group. The HS let them march in the homecoming parade as they let all the community participate in it. They put the bagpipers right in front behind the color guard. The teacher in charge of the parade said that there was just something majestic about the bagpipes and thought that they should be with the colors. The HS band was way back in the parade. The crowd went wild when the pipers marched by. These kids were competitive bagpipers, all homeschooled and could play the HS band into the ground. It was probably a good thing that the regular band was far from them.
These kids are now all in college and most of them a couple years ahead of their peers.
They are supplied, but the "price" is enrollment in school. They can decide to pay or not. It is fully up to them.