I think Leon's number is probably not too far off. From what I have seen, at the Nationals and the bigger regional shows, even when they were better (EPSCC, Strongsville, Robert Morris) and there are/were never more than a few hundred people focusing on pre-war cards (as opposed to the 50's/60's crowd). And, presuming that the committed collectors would go out of their way for a big show, I would think that a show like that might attract 5-10% of all collectors, then maybe 3000-5000 is a reasonable number.
Maybe Ted/Bill Z/Mike W or another pre-war dealer can confirm the numbers of customers they see at a typical show.
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