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DavidI'm not a trading card person, but in esoteric areas I find much undervalued (my opinion) material and also, due to the inefficency of the auctions/sales, many great deals for long term holding. I specialize in baseball photographs and find many areas (ambrotypes, for example) where the prices are surprising almost unjustifiably low for the quality. Of course, just as with some players, some material will always be underrated.