funny this showed up today. My DH's physical therapist was here this morning and commented on my 20"x26" table mat I made yesterday using my new mini Twister tool -- fun to make. Anyway, she said "you should sell these" So I asked her what she'd pay for something like this. She thought about it so I asked if she'd pay $20? She said "I'd pay $10". Then I told her I had $10 in fabric. That really surprised her. Then she commented that $20 wouldn't even include a fair price for my labor involved. Then she understood.
That's why I don't do craft shows anymore. Just not worth my time and effort.