As I sit here and read posts and ponder, it occurs to me that this whole thread is just a bit silly. I'd wager that very few bicycle collectors have a truly substantial amount of money tied up in their vintage bicycles. Yes, I know of a few people who might have more than $20,000 of "investment" in vintage bicycles, but that certainly isn't why I'm in the hobby.
I have a total of 8 bicycles, six of which are vintage road bikes. Each of the six is a great rider, but I doubt I could sell any of them for more than $500.00. I care much more about being able to keep them in sound, rideable condition than I do about how much I could sell them for.
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In search of what to search for.