First thing you ought to do if you're trying to predict who will have been a great investment is rule out anyone whose cards are already expensive.
If I could go back in time 30 years and buy a poor condition 1952 Topps Mantle for $1,000, it would be worth $25,000 today.
But if I go back in time 30 years and invest that same $1,000 in minty-looking 1985 Topps Tiffany Mark McGwires, sell them all in 1999, reinvest in Barry Bonds rookies, sell them in 2005, reinvest in Lionel Messi rookies, and sell them all in 2021, I would have enough $ to buy a PSA 9 1952 Topps Mantle today.
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