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Marc S.I've found that most collectors I know and deal with keep a "private stash" of really neat cards that they don't necessarily want -- but are nonetheless unwilling to get rid of unless they get something equally neat in return.
This is cool in many ways, as I have built some pretty neat networks and have interacted with many hobby heavyweights who have taught me much. Nonetheless -- sometimes I think it is regrettable that certain rich folk seem to hoard key cards/issues unless they are able to demand trades on their terms. But, 95% of the time, trading is a wonderful experience and one of the best reasons I love this hobby.