I have always wondered what amazon was thinking with that way of sorting.
Perhaps it's a deliberate way to spread purchases out over a span of products instead of just the two top products?
I think it's about a product discovery. If we always sort this way, new products don't have a chance.
And I don't think Amazon would sort like this, it would make more sense for them to use hn/reddit way to sort items that give a chance for the new items to get to the top.