Collecting Baseball cards is a hobby, and you should collect the cards that you enjoy. As an investment to make money it is difficult to know which cards will be worth more in the future. Cards made after 1980 With the exception of limited edition issues were over produced, have a low value, and make a poor investment. Limited edition card are only as valuable as the demand in the market, and over time collectors can loose interest in them. It is very typical for new cards to sell at a high price when first issued, and loose value as time goes by.
The older cards made before the 1980's, and tobacco era, pre war cards make a better investment as the cards are fewer, and collectors are growing in numbers. Investing in trading cards is a poor choice unless it is done as a hobby or for the enjoyment.
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This is literally like asking how much a woman invests in jewelry.
Some people may just collect cards of their favorite player. If that player is Mickey Mantle, and they've only bought his cards, they may have spent hundreds of thousands of dollars. If that player is Ryne Sandberg, maybe they've only spent a few thousand.
In sum, there is no limit on the top or bottom. Just like any other interest or hobby, you start small and accumulate...