Your items look great!
As others said, people don't appreciate what goes into a hand made quilt, so don't want to pay the money.
For craft show, I think small items sell best. Maybe you can make table runners, placemats, etc, in the same colors as your large backdrop quilt to entice people to buy a small "part" of the featured item. Color Block your both, so to speak.
With a business card attached to every item, people just may contact you later, to buy the more expensive items. Just a thought.
If you are looking for more or different ideas to display your quilted items, do a Google Search of Trade Show Booths, then click "Images". You will see many professional booths but also many beautiful homemade displays to inspire you.
I had to create a dog breed booth for the Meet the Breeds event in NYC and that is where I started. Keep in mind easy to transport and set up yourself and cheap to find materials. Have FUN! That's what it is all about!