Those are all very good points
I see posts by so many crafters who are disappointed
with the results of their shows.
When I started shows years ago, I learned so much by
reading reports from crafters on what their best
sellers were when they had shows. I learned to
make many of those items over the years and that has
helped my sales.

Excellent points. I can spot mass produced things a mile away ! I look for prices that are reasonable ( mine are affordable so I won't negotiate prices ) One more thing I like to see is a neatly dressed crafter. The man I was next to at my last fair was wearing raggy jeans shorts and a tee shirt. ( ugh ) Him and his whole set-up looked ..."rummage sale-ish" . After all these years of going to & doing fairs - I learned ALOT !

"...Mark your prices clear and be able to negoiate..."

Never! You negotiate at a flea market, never at a craft show. Our prices have always been firm. The only way we would reduce our price is if the customer buys in quantity. I give 10% off if someone buys 5 or more frames. But then again, 5 frames comes to $100.00 so I will give a discount there.
If you're willing to negotiate, then you've priced your work too high to begin with. Find a price and stick to it.

If I decide a craft is not selling well because of the price. I wait until the next show to lower it.

There is a little show I do at the end of the Year.
At that show I set up an 8' table with price reduced items for sale , just those items I want to discontinue.

Prices are never negotiable at my shows, but a discount for bulk is offered,,,I have had people buy a dozen ornaments for grandkids,,let's say that would of cost her $24,,I would let her have it for $20,,,no other exceptions....