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hankron3 important points for baseball card investments that are often lost on total beginners:
1) Diversification, or variety, is important. It's a mistake to invest a lot of money in one or two cards. In this sense, a nice collection that you enjoy looking at can be a sound invenstment.
2) Buy at great deals. Some people think that if the card has 'investment potention,' it's fine to over pay in the beginning. Common fatal mistake. If you overpay by 2x, that card has to double in value before you break even.
3) Regular selling, such as on eBay. These people have a more honest feel for the market, including the practicalities of selling, and will make better buying and investment choices.