I do a lot of shows, perhaps way more than I should. But the wife and I get a get a lot of enjoyment out of it. Your booth and workmanship is quite impressive, however I agree with what has already been said. I don't have a clue about your prices, but definitely toss in some attention getters, bait and hook low price items. Personally I put my portraits in a low cost, "display frame" ( Dollar Tree) and stress this to the potential customers saying that they will fit in any standard 8.5 x 11 frame. I also add that I had talked to a frame shop and the cheapest frame price I could get was over thirty dollars which would more than double the price of my items. Selling between $20 and $35 may be low, actually may be very low however at that price my work is getting into the hands (slowly) of happy customers, and people are actually looking my show schedule up on my face book page and coming to look me up. However I do chuckle as the wife keeps saying she is going to start charging $5 each for compliments. So anyway I had to look at why I am doing the shows is it the bottom line or the enjoyment I get meeting and greeting so many awesome people, I finally decided if I get back a portion of my expense and know that I am never going to get rich doing the shows, then I am well satisfied.
After all isn't the enjoyment we get out of doing what we do, why we continue to do it?