Worth - I dunno. An art dearer I knew a while ago told me " something is worth what someone is willing to pay for it". If the market price for an NJS frameset seems exorbitant to some that's fair but as someone who just had an NJS frameset (from NJS export) built with mostly non NJS components I'm pretty happy and would buy one again - seems like a lot of people around the world feel the same way:-)
ride what you like, a lot of fun bikes out there...