[Thorrez]

That funky thing sounds like it would work in authors' favor overall. I would guess there's some percent of credits that are sold but never used. So if Amazon only paid on on used credits, Amazon would be able to keep that money. If Amazon pays out on sold credits, the authors get it. Although the distribution between the authors can be wrong, leading to some individual authors losing out even if authors overall benefit.

Although if Amazon is always paying out some contractual minimum instead of the shared amount, then none of this makes a difference.