There are way more C&V bikes existing than will ever find riders. There are fewer and fewer riders willing or able to maintain an older bike. Many who would be well served by an older bike have been convinced that the maintenance is impossible. Worse, they have been convinced that normal features of old bikes. as dt shifters or skinny tubes, are only suitable for those with a death wish.
Something happened. Can't turn off italics. Anyway, was about to say it just doesn't matter how well the bike has been prepped for sale. Very few will have any appreciation of work that has been done. They don't know you aren't selling them an alley find worth maybe $20. And sadly, the fate of most all of our vintage bikes is scrap metal or landfill. It is going to happen.