I've done it with Old Judge cards and I know others have too. Basically some cards are so rare that one person having two of them will drive up the price, so collectors won't let them go cheap, even if they have one already.
That being said, I'm not good at trading. I have at least 100 extra t206 cards I've never sold/traded, and got them all at least eight years ago, some over ten years ago. I have a handful of extra Old Judge cards too and I specifically bought an e92 Mathewson off ebay just because it was extremely cheap, with the intention of using it as trade bait. That was in 2002, still got it...
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