That's the A10 algorithm at work. It's part of Amazon's search system. Basically, a ton of math gets done behind the scenes and the algorithm is what decides whose books are at the top of the page.
Yeah, I was just wondering what insight (if any) people have about this?
I can see why the algorithm would prevent the same keywords sending a book to the top of the search every time.
But then part of me is wondering if my books are not sufficiently successful to justify a higher place and that also plays a part?
Obviously, no one knows for sure, but was curious about the general consensus?
> But then part of me is wondering if my books are not sufficiently successful to justify a higher place and that also plays a part?
That's the gist. A10 is an advertising engine, and Amazon thinks it has a better chance of selling the books above yours. Could be they already sell more often. Could be they're newer. Could be Amazon putting its thumb on the scale for books it's promoting or imprints it runs. There are piles of factors, the least of which is relevancy.
Adding onto what Sal said, A10 *apparently* favours keyword accuracy a little more than its predecessor did, and some sites have claimed click through rates (CTRs) might factor in more as well as buyer searches.
It's all anecdotal, though, given Amazon doesn't like people peeking behind the curtain.
Going off my own searches, it does seem like rank/sales don't factor in quite as much as they used to. Almost all the books listed above mine are ranked lower, but I've still fallen down the results ladder so to speak.
Competition. And search engine stuff.
Try logging out and searching anonymously. See if the results are different. Search engines learn what you're looking for, and try to show you other things like that (I get weird results because I forget to search anonymously).