OP's writing is nice, but he is de facto a scalper looking for the maximum amount of arbitrage. There's enough of them, like mentioned in the article, that they'll pick any flea market or secondhand store clean off diamonds in the rough before you as a regular guy really get a chance to find any.
What they're doing isn't illegal or forbidden, but it has completely destroyed the spirit of flea markets and secondhand stores as quaint places. And in response to becoming as hypercapitalist as the rest of society, a large contingent of people on flea markets has started to offer whole tables stuffed with cheap AliExpress / Temu crap. Or AI art being sold as "handmade".
The enthusiast offering artisanal coffee or lemonade or cinnamon rolls from his stall or food truck has quadrupled his prices, because if everyone else is gouging the visitor, why shouldn't he?
The same goes for secondhand clothing stores. They're wise to the scalpers looking to flip stuff on Vinted or whatever, so they have also doubled or even tripled their prices. It's an open secret that a lot of stores let the girls working there have a first lookover of whatever comes in.
