Really though, if you have the goods there's a rich collector somewhere that'll buy it.
I do occasionally see these things running around here, especially at some of the more popular biker spots like Aso mountain here in Kyushu as well as up north in Hokaido. There are also lots of listings for them in the biker magazines and such, but I don't recall ever seeing one for sale in a dealership. Either way though, they're always fetching premium prices.