If you need rid and don't mind quite low prices I'll take them off your hands (and anything else mag related).
But seals/bushing kit the most desirable, mainly for the wiper seal, bushing next but they tend to last forever. Good reason for an oil damped bath fork.
Air vales not so much as you can make them.
Long travel, can be a faff to change over or you can alter your own anyway, but people do seem to want them. It saves getting a saw out.
And boring is an o-ring.