I'm sorry you feel overcharged.
It contains 33 full-color pages, as advertised.
With 'unfinished' you mean a whole Comic Series. As a self-publisher that's what it takes to survive and to allow me to continue making more kinky stories. Of course, you can head over to DOFANTASY (FANSADOX); there one issue costs 27 pounds (30eur) PER ISSUE—and they are a publisher (and one would expect to find it cheaper there).
One of the trade-offs with the comic format: it has low information-density. It's a bitter compromise between artwork and speech bubbles. That's why I began exploring Novels and Illustrated Novels after Slave Jessica, because it allows me to tell a broader and longer story.