What is the best/worst you've done when selling at a swap meet?

Ive never had a real bad experience. Most meets It's about $300-400 per day. Best was this past April in Portland. Did around $2000 minus $500 for hotel ,gas, etc. Most people were good to deal with. Had one yahoo come by with his buddies looking for a 70-71 quarter marker light. I had 4 in a box. He looked at one and asked how much? $40 I said. $40 I'll give $10 he replied. I guess we're not doing business today I said. He hemmed and hawed for a bit then said I'll give you $40 for all 4. I counted out loud. Hmm, $40×4 makes it about $175. He said, why is it $175? I replied, because Im charging you 10% for tolerance. At this point his buddies erupted in laughter. He said let's get out of here, and away they went.

I'd also add that I think you do better if your items are organized and easily accessible to customers. On tables, in bins, and labeled.