This does not make much sense to me because vintage cars can be a multiple of a new model, assuming the marque still exists. In audio, some vintage equipment is highly prized and quite expensive- think WE anything, EMT tables, Studer mastering decks, vintage big horn studio monitors, etc.
What are we trying to focus on?- I was able to build systems more cost effectively in the period 1970 to say, the oughts of 2000 via used equipment. Once we got the supply chain whammy, no chips, existing equipment that you could get NOW became more expensive. I don’t think you can generalize- a specific piece of gear may be a grail or a trip to the dump. Ditto, certain cars. Old isn’t always good, but some history there too.
What are you really asking?