I am baffled at the amount how much the author makes from each book. 31$ production costs seem high but since it's 427 full-colored pages it seems reasonable. H

I am baffled at the amount how much the author makes from each book. 31$ production costs seem high but since it's 427 full-colored pages it seems reasonable. However, how come Amazon takes 22$ dollars on top of that? There is no way it's that expensive to distribute the book, there must be some other services involved? Although the pricing seems weird, the pie chart shown on the page is even more so. How it's possible that Amazon is most of the pie with 40% percentage?