I'm sure I'm going to be lambasted here and I may be the only one who thinks this way, but I have always thought these bikes were ugly. Specifically the fork....it just doesn't flow with the rest of the bike and looks like an after thought by the designers. From the fork back it is awesome and I do think the fork itself is a piece of art. Together they just don't work.
Rare and valuable?...yes....
Actually an attractive overall design?...no...
I think if these bikes had been mass produced and readily available today, they would be the Edsel of the bike hobby.....
Of course this is just one guy's opinion.