$45 for a year long knife show, and you guys are questioning the price? Come on. Thats a no brainer. If your stuff is good it will sell. If it doesn't sell, get better. Beats $500 in table fees plus $400 in airfare plus $450 in lodging for a three day show.
If you are just playing, thats fine. But if you are in this for real, put down your money, make a knife that people will want and take your chances.