Using roulette as an example is a logical fallacy. When you play roulette, you have a known loss rate. It's small and static (let's call it 3%). You can't compare that to investing in baseball cards, or stock, or real estate where the returns are unknown.
There is every reason to believe that a person can make money investing in baseball cards. Just look at recent returns. There are a lot of people that feel comfortable investing in that way. Any investment can lose value, and cards are no different.
People that are calling cards a gamble are just missing the point. Your investment portfolio should be diversified. If you have a diversified portfolio, I'm certain that you own some investment instruments that are far riskier than a PSA 9 Jordan rookie. They are just offset within that particular fund by other, less risky investments.
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