I've pretty much run the Fall Swap Meet for the last 15 or soyears, with a lot of help from a lot of guys....
Several times I have seen folks exiting with huge piles of stuff....I became concerned that theyhadn't sold what they hoped. When asked, they reply "oh, no, I had a GREAT time....sold a TON of stuff! But I BOUGHT a ton of stuff too!".....
Most simply exchange stuff, I think....