I used to sell at one
Sold live chicks, in an area where chicks are normally raised by the buyer for butcher.
I have an endangered heritage breed that's meant as a dual purpose bird (meat, eggs) and was bred to be extremely hardy as they were kept on sailing ships historically. They make great "back yard" birds, and my buyers knew this. (I had a couple other breeds, and people would consistently ask for the "black and white birds" ... even if they didn't know the breed name!)
The chick sales paid for feed for the breeders & I kept enough of the best chicks back for the next generation for a couple of years ... I hatched my own and undercut the price at the feed stores by about $.75 and did a good business, often selling out in a few minutes after I pulled up. I'm STILL the "chicken lady" when I pulled up.
It was a hassle, though. I constantly had to deal with people who thought because they were dealing directly with the breeder, they should be able to buy chicks at ridiculously low prices -- my break even point was $1.25/chick and I tried to get $1.50 a chick. People would want to pay $.25/chick. And throw screaming fits if I wouldn't sell for that. This was something of a cultural thing -- most of my buyers are Mexican immigrants and in Mexico bargaining is a pretty much a combat sport -- but it's annoying when they won't take NO! for an answer.
I also had another seller want to buy all my stock at an utterly ridiculous price -- and then when I wouldn't sell, she spent the entire day telling people in Spanish that my birds were sick. Her stall was before mine on the general flow of traffic, and that was the ONLY day I ever took birds home. I only found out about this at the end of the day when a Spanish-speaking friend tattled on her.
Let's see ... I also had someone demand that I hold my ENTIRE stock of laying hens -- I was selling about forty hens at the end of the breeding season -- and he'd go into town, get the money, and come back and buy them. I don't hold birds because 1. they sell in minutes -- why would I want to sit around for hours wanting someone to come back? and 2. People often promise to come back, and don't. I told him, categorically, NO.
Two hours later, he shows up as I'm putting my cages away, with the hens all sold -- they'd actually sold to the next guy who'd come along a few minutes later with cash in hand. (Who had just completed a henhouse and was deleted he'd have laying hens that day and wouldn't have to wait six months for chicks to grow up!) I'd only stuck around because I had some other stuff to sell.
Mr. I-demand-you-wait-for-me was so furious I'd sold the birds HE wanted that he "accidently" ran over my cages with his truck, then sped off yelling, "Whoops! That was an accident!" out the window. No license plate on his truck, either.
Then there was the woman who I told turkeys were $10 each, and she said she wanted all of them, so I loaded 20 turkey poults into a box and asked for the $200 and her boyfriend grabbed the box of the poults, put it in her car and she tried to talk me down to $50. Wouldn't give me the $200 we agreed on. I had to threaten to call the cops before she gave me the poults back. She was acting utterly "righteous" and said that $10 was too much to charge and I should be "ashamed" of myself. (Baby turkeys cost more than that ordered from a hatchery!)
At any rate, the pure hassle became too much -- the farmer's mnarket was NOT well run (and has since pretty much become a flea market) but I'm afraid I'd have to deal with stuff like that anywhere I went.
