I have been a seller on amazon in the handmade section for over 5 years, almost 5 1/2. I haven't personally been as badly treated by amazon as others, but I can verify that there is no seller support there. It is in name only, with copy and paste replies that don't address the issues. Different people give you different, conflicting answers as well. It has taken until very recently to actually find out how to use key words from the horse's mouth, so to speak. They don't even appear to read the case you have opened most of the time, and certainly don't comprehend it, and nothing that amazon breaks that had been working before is ever fixed, despite many complaints from sellers. I gave up long ago on trying to get anything fixed or resolved. Amazon have made it increasingly difficult to communicate with them as well.
Another thing is that it's as though amazon staff want to look busy so they mess with the product listings. For example, there used to be an ample sized area to write the title of your product so you could see and access the whole thing easily. Some idiot several years ago decided to change this to a tiny slot that has to be accessed by scrolling from side to side to read and make any necessary corrections, which greatly increased the amount of time this takes. No amount of complaints would make them change this back.
I personally had, with no notification or reason whatsoever, some of my listings marked 'incomplete' after they'd been listed for awhile. They were complete and nothing was wrong with them, but this meant that they disappeared from amazon and were stuck in a sort of limbo. I had hundreds of listings on amazon and didn't go back to look at earlier ones without reason, so this meant that this had happened years before I found out. I have no doubt that one of their robots did this.
It has taken amazon almost 6 years to decide to add bullet points to handmade listings. In my listings, I wrote my descriptions on different lines to try to make them as close to bullet points as possible, but their system ran all of my words together. I don't plan to go back and rewrite all of my hundreds of listings. In fact, I am for all intents and purposes through with amazon. I set out to close my account last year, but I couldn't just click on close account. There was so much I had to do first that I just left it until I have the will and energy to do all of that. I reckon that if someone wants to buy something that is already there, fine, but I haven't been adding anything else for some time and don't plan to. They have been waiving the monthly professional selling fee for handmade sellers indefinitely, but I still have to pay 15% fees when I sell something. I think they would lose their handmade section, or most of it, overnight if they charged the monthly fee as well. I haven"t found amazon a good place to sell handmade items and wouldn't recommend it. However, I have not experienced any scammer buyers of my handmade items. It's the sellers that have been the scammers, or attempted scammers. I didn't let them get away with it.
When you make a sale, amazon send an email, usually, including a thank you for selling on amazon. However, I have never felt in the least bit valued by amazon as a seller during the entire time I have been there. Giving a seller a lip service thank you and the rest of the time acting like the sellers don't matter doesn't cut it. What really made me want to leave for good was their latest dictatorial move of, without the sellers' permission, publishing sellers' names and addresses, including personal, what should be private, ones on amazon for all and sundry to see, not just someone who has bought something from the seller. Having been tantamount to and worse than stalked, I don't appreciate amazon making that easy. Amazon are dictators, there is never any discussion, if you don't like it, leave or put up with it.