Used to do a lot of craft fairs many years ago.
Came to the conclusion that the only way to make any money was to be the bloke charging admission.
I hauled my marquetry wares across a good few counties. I used to hear comments ranging from "patience of a saint" right through to "our cousin Billy used to do marquetry...and he was a lot better than you"....
Yes, you need a thick skin!
I finally gave up when the lady on the stall next to me had a roaring day. Some of my marquetry pieces had literally taken days (in hours) to complete, but were all "realistically priced" to sell - probably less than a fiver an hour labour.
The next-door lady's "craft work" involved sticking a pencil into a polystyrene ball with a face on it.
She sold ****ing hundreds of 'em.