We all know the problem with this event and most of us are seriously disappointed with it. I would urge the developers and other people on the OOO SK team to actually try to find a book (the legit non-code futzing way). If you don't play your game and your events you won't know what to fix. The SK community is well aware of just how horrible this event is; this event's greatest item is not available through good hard work but is handed out at random to anyone who kills a Black Kat. The chances of obtaining the Book of Dark Rituals is so astronomically low that one could play the event year after year and still not obtain it. Your players are getting fed up with this event, the only players who can make full use of this event are the ones capable of buying a Book off another player and those with the CR/CE to buy a slot in the Margrel party.
Allow us to trade in ancient pages for Books
280 pages for one Book (bound on trade) should be fair.
Considering the BK hood is 70 tokens (140% more than the other Base Kat hoods) and it takes 200 tokens to be able to craft a Class Kat hood.
This one little thing would make this event much more enjoyable and rewarding for the harder working players.
Black Kats are already a completely random occurrence anyway, why would they make the book an ultra rare random drop from an already randomly-appearing enemy? They must just expect everyone that fights Margrel to shell out real money for Energy to a) Convert it to Crowns to buy the book from someone else, or b) Buy a (probably heavily overpriced) slot in a Margrel run. Either that or people haven't been vocal enough about it, and they just don't know how frustrating it is, but in that case, like you said, they still should playtest it to make sure it's alright instead of relying solely on our feedback.