It may be the same thing happening to the QP Sport GT with Duoselect. A couple of years ago there were quite a few for sale then values stiffened a bit and settled at around 35k for well looked after examples wth the correct colour combos. Now you would have to be patient to find one as like me the owners I have met have mostly decided to keep them as possible future classics like the GS will no doubt become.
Good 3200s are thin on the ground and with maintenance costs being what they are why sell it for around 10k. After all if you can live with the running costs 10k isn't the end of the world especially for such an iconic car which has charm by the bucket load even if it does sometimes try to kill you everytime it rains. (Unless you're good of course)