Our experience with card dealers at shows and flea markets has been disappointingly, annoyingly similar to Kevin's. No excuse for it.
It often seems they've gone out of their way to be inattentive, uncooperative, condescending, and unfriendly for the sole purpose of
later being able to grouse about how little they sold.
There was a thread here last fall asking for advice for "first-timers" setting up at a card show. All the good advice given there in reply
seems to us to be good advice for any dealer, whether they've set up once or a thousand times, and we'd put things like "a friendly attitude"
and "acknowledge every potential customer" at the top of the list, with "realistic prices" and "prices clearly marked" close behind...
http://net54baseball.com/showthread.php?t=213413