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davidcyclebackTHE key to reselling is knowing what prices you can sell the cards for. If you know what what you can sell a cards for, you know what is a good buy price. The advantage a big dealer has is he has lots of hands on experience with selling and realized sell prices.
Similarly, bad card investors focus only on "what a 1954 Topps Hank Aaron will book for in the future," when the investment is also determined your buy price : Buy versus Sell Price. It's a better investment to buy the same card for $100 than $200. This doesn't dawn on many investors, as they pay 2x market value to hoard a hot rookie. Many investors lose money when the cards go up in value, because they overpaid at the start. Many investors make money when the market prices are stagnant or even go down, because the bought at a great bargain.