The reason for this is that the dealers on the convention floor pay for their tables in exchange for the privilege of selling their stuff for cash. If the trade sessions allowed cash transactions, there would be little incentive to pay for a dealer table.
Bring your cash to the show floor and you will find LOTS of stuff to buy.
(BTW, I'm not a dealer, but I appreciate all the stuff they bring to the show floor for us to look at ... and buy.)
You'll enjoy the show -- I've been to all but one, and I still look forward to it each year -- both for the chips AND the friendships!
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