For a Warren Buffett style of long-term hold, 99.999% of all cards are a terrible investment.
I have a low risk appetite for actual investment so dropping hundreds or thousands into any one card isn't it for me, especially since cards aren't liquid assets.
For short-term buy low, sell higher, there will always be opportunity in market. But if you're buying ultra modern, you can't get greedy holding out for more gains if you happen to make the right initial bet - the window to sell and maximize profit is almost always shorter than you think (there's 100s Kevin Knoxes for every Giannis or Steph).
For 'investing', I generally avoid things like RPAs & #ed Prizm RCs and focus on things that take advantage of supply/demand dynamics as opposed to things like how many playoff games Luka wins.
For example, college autos of legitimate college stars (even if they didn't have NBA careers) from blueblood programs will always have demand due to lifelong Duke, UNC, UK, Kansas, etc fans wanting memoriabilia and a limited supply.
If I see a cheap Luke Maye Contenders auto, I'm buying it because he's never going to have another UNC card and he'll always be fondly remembered by UNC fans.
I'll also buy super low end stuff of one or two rookies from every class that I like. I have built pretty large Devin Vassell and Jaden McDaniels stashes of base RCs, non-numbered Select & Optic parallels, and such and hope both break out in a major way this year. It didn't break the bank to buy and even if they never pan out, I like the players and can likely still move them via mixed eBay lots and COMC.
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