Pieces of cardboard.
Yet, here you are ... reading & posting in threads about cardboard.
I'll take your cardboard off of your hands if it's so trivial to you. LOL
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Myself - I am continuing trying to combine and balance collecting + investing.
Collecting -
I began buying packs of cards as a kid in the mid-80's.
Used my paper route money to find vintage off-grade football HOF in bargain boxes at baseball card shows.
I was looking for Bobby Layne when everyone else was hoarding Gregg Jefferies RC.
Bought my first pre-war card by answering a newspaper ad - I was 13, 14 years old.
My dad drove me to the guy's house & I bought a beat-up 1941 Play Ball Ted Williams, trimmed w/ taped for $25. Still have the '41 Williams.
I was hooked.
I love Goudeys. I love T206s. I love E-90s. I love Diamond Stars. etc. etc.
Investing -
When I get to 4 or 5 years before retirement, I want to sell almost all of my collection.
Take the funds for a nice down payment on a parcel of land + cabin in a glorious river valley in Montana.
I can trick my emotions by saying I'm taking a younger life goal (cards) and transferring it into my retirement life goal (river cabin).
New chapter of my life.
They are just "little pieces of cardboard" after all.

But I will still keep that trimmed '41 Ted Williams w/ the tape.