Value on a normal collection of players, teams, etc is really tough. If you believe Beckett my collection is worth $125k but that's using their inflated values as single cards (I collect a team).
My collection is in no way liquid- it is extensive but anyone who would want to have it would either already have most of it, or want to collect it themselves. After all, that's part of the fun.
To answer your question, I value my collection on what is liquid. My vintage cards and higher value rookie cards are the main things that come to mind. Stuff like my 1989 Score team set isn't even part of the equation because it isn't at all liquid. Same thing for some of my more scarce things like my 2003 Kanebo Silver parallels.
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