It stems from random store availability, the fact the books are getting canned, something about how even Nexo Knights is selling way better. etc. The books are getting canned? Say what? Even Nexo Knights? Nexo Knights is a brand new theme for this year. Obviously it's going to sell better even if its complete crud because it's a brand new thing. Plus all of the old Castle fans will be out gushing/modding/complaining, generating buzz. Whoops I made a mistake, it was said in this TTV interview (at the 50:00 mark) of G2's author that he doesn't know if there's gonna be any more books in the future. Take that as you will. I guess your right about Nexo Knights. Not much of a business person myself.