I've tried to come up with some sort of logic on this. There are things that one can point to such as players who you saw live, players your parents saw and may have spoken about fondly etc, but can't really figure it out. I know some have looked at trends for other hobbies such as stamp and coin collecting (both of which I know almost no one who has any interest in... though that just be the people I know).
Obviously, I think time will tell. I do find that as people get older many collectors of newer cards or items start to appreciate the older stuff.
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