If you can't, the show isn't worth it. My dealings with shops have all been favorable and fair. I have been in a mall and a couple country shops. Unfortunately the mall wasn't very good. A craft mall has to have good traffic, parking, and crafters.
Customers have to want to buy in the shop and come back.
Advertising from the shop is very important. I'm in because the owner advertises and has a good customer base. Also it builds a good customer base for my dolls. There are advantages to being in a shop but like a craft mall, you need to do your research. Since i work full time and craft part time, I felt that being in a shop and doing only selected fairs throughout the year in my best interest.