People can go nuts over lights and lamps just like anything else that is no longer made.I have a couple friends that do over the top restorations and would pay what ever to get the correct date coded lamps. I have always been a watchdog here at FBAO for people selling at over the top prices. If I see NOS I look for factory part numbers and packaging. If it doesn't include those, they are just good used parts.
I'll admit, I've got these on the shelf because I thought I might be doing a fair amount of back woods night driving. They're staying on the shelf 'til needed! I got lucky finding them on epay. Did I overpay? Answer to that is very subjective. Totally worth it to me - except it turned out I haven't had to use them.