Ironically the people targeted as non-payers, the ones who drink, smoke and gamble, pay a lot of taxes on those things, so probably assist in a large contribution to schools.
Also, we travel. I believe more can be learnt from travelling and having experiences than from books alone. So we travel. We travel by car mostly, because we can see more that way, but we have travelled by boat, plane and train before, too.
The public schools near us are not suitable for my dd who is on the Autism spectrum, so I pay for her to attend a non-govt school. I don't contribute extras. That's my choice. Other people give monetary donations, that's their choice. They can afford it, I can't.