I've spent a lot of money on this stuff over the years and it only retains its monetary value if someone is willing to pay for it. Technology has come along ways. Things can be built with precise chemical construction and mechanically to tighter tolerances therefore "better". And yet intentionally this godsend all to often sacrificed by some manager somewhere for profit margin translating to personal gain.
"Older" things have their own special quirks, though sonically desirable, take the nitro finish on my old explorer. The finish is all cracked because it breaths. Humidity changes, temperature changes and I do not live in a hermetically sealed museum therefore... is its value hurt monetarily, historically or has its value increased simply because I or someone else has had it?
I guess "worth" is subjective.
