Risk Analysis of the Collectibles Market

(Just a disclaimer that I understand very little about finance and risk analysis) what would be the best way to analyze the risk of a non-equity asset
specifically the collectibles? I have been collecting trading cards for the past 4 or 5 years now
and have recently hit 5 figures in cards. Now that it has hit that sum
I'm starting to view it more as an investment and less as a hobby. Would there be some kind of beta that I could calculate? Thank you for your help
( sorry if I messed this with typos
since I typed this out on my phone)

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Aug 13, 2018