We pay Hachette for their good judgement
The traditional publisher and the author do a lot of work together that ends up giving us a better book. I am not sure that Amazon deserves a similar share for the work it does to deliver an ebook.
Hachette, and all the other traditional publishers. know they are taking risks, and giving us a better text, filtering the drivel-storm, is something they have to do to limit their risk.
Amazon doesn't do any filtering with the Kindle Direct model, and, believe me, you can see it. All you have to do is buy a few cheap ebooks and you will see it. There is a filter that comes from forcing the author to deal with the US tax system. but that's no effort for them.
It's a waste of my time to try to sell my writing through Amazon. I get better filtering from giving my stories away on fan-fiction sites. The Kindle is a nice enough tool, and Amazon run a decent, wide-ranging, internet retail operation, but no way are they a publishing company.
Dare I post a link, even a weird one? What's the point? The problem is finding stories that you like. I think that Google might matter more to authors than Amazon ever can.