is there still any demand or market for Hayes rear 22mm caliper?

I have a Hayes HFX rear disc system that uses the rare 22mm caliper. I know it is a really odd size and only a few older bikes seem to still use this size. I am not sure if I want to get rid of it or not, but part of that might depend on if there is any demand for it? I am posting this here because it seems like the people who know about this item are the ones that ride the older bikes.

Thanks