I had a table for four straight years at our Blaine swap.
Also had a table when our swap was at its best at SPA school in St. Paul.
Those of us that were buyers coughed up for a table and brought cash. Lots of it.
Often, the very best deals were at the end when people were packing up.
Folks don't like to pack up, so we would lighten their load.
I'd imagine that most swaps are similar.