We stopped selling about a year ago on Amazon. At one point we had 5000+ different products listed. Amazon over the last 3 years went from carrying ZERO to carrying 95% of our products, all at or near our cost. Sadly, in our industry, many of the large manufactures, that are the majority of our sales, gave Amazon price breaks to get them to carry the products.
The do sell a fair amount of the products below both ours and their cost. We were told they do this to drive traffic to their streaming products and e-books.
Looking back on it, we should of de-listed everything the day they started selling our products at a price where we could not compete. All we did was give them a ton of sales data that they used against us.
Good luck to all that sell on their platform.
In the end, it is their playground with their rules. Unless the product is unique or out of their reach I would be leery as to what you list.