I think it totally depends on the show. I used to do about ten shows a year that were affiliated with a big Harvest Festival organization. We sold Christmas ornaments. We also did lots of local ones. The Harvest ones ran about 6-800 depending on the size and location. The locals we did were all well over 200. The more money you pay, the more advertizing they are supposed to do or more established, all that sort of thing.
When I first started we easily did a minimum of ten times the price of the booth. But that went down a lot over time. It got to the point where you were lucky to make booth fees and overhead. Which is why I am not doing them anymore.
I do want to start up again with other stuff besides ornaments. But the cost of business licenses and tax stuff is daunting.