Have any of you have wondered why the same book is often studied more than once at the mid-week study, several years after it was first studied? It's because the book is over-stocked at the factory, and the WTS knows that over a period of several years many dubs will leave their cult and be replaced by new suckers.
I'd like to add a point. JWs who have already studied the book once at the book study may want to get a new book to underline or highlight the answers again. If they start over fresh, they may actually understand it! What a concept! Didn't work.