I totally agree with you on Ralphs, Carhartt, and others. 5,000 or more people starting to sell the same thing, the same description, the same photos, clones.
They copy everything that comes out with V tools. They will kill themselves.
From experience, buying and selling on the same channel collapses the method. It reminds me of flea markets, those who bought at one stand and resold them an hour later at their stand. It worked for a while, and those people disappeared because the people they bought from, and who often think they are doing a good deed, didn’t like it, so they stopped coming to sell.
I think you shouldn’t resell on the same channel where you buy.
For dropshipping, same thing, nothing new. Many people have understood how it works, but there are so many of them that it still works, but less and less well.
Market saturated with sellers, surely, like everywhere, since the world only runs on consumption of goods. However, selling remains a job, and many mistakenly think they can live off it, certainly because of all the videos on social media or elsewhere that circulate, telling you it’s easy, you take a photo, you put a good title, and it sells for 50 bucks. If it were that easy.
It’s like saying, well, be a baker, you put a little flour with water, you sell it 10 times the price, and that’s it.
There is always a period when the supply will be insane, like with e-cigarettes for example, they were sprouting everywhere, then the sorting happens, those who don’t know how to work sink. It’s the same online.
For a lot of reasons. Organization, prices, sourcing, storage, sales process, taxation, understanding the psychological aspect, or very basic things that are not put in place.
But of course, you can still earn a little each month, a non-negligible supplementary income, because it’s true that times are tough. Some do it to pay their bills and eat. Others are more dubious 
Technology and AI don’t replace common sense yet :).
For eBay, there were no negotiations, quite a few problems with shipments, yes. And very high operating costs, which are now 20%, plus shop, + + + +. They were too greedy, they must still operate with the US market. But eBay has been invaded either by crap or by very expensive products given the fees to pay. I’m still on it, but I plan to close my account by the end of June. I’m making 5% of what I was making 10 years ago, and 10/15% of before covid.
The shift was in 2021/2022 for Vinted, the arrival of bots, the fact that some started to do real business with the authorization of pro accounts in 2022.
These are constantly evolving markets, and only those who adapt survive!
They still bought it this morning despite my « no, I’m not a shop, the measurements are in the listing 
».. I don’t want returns 
