They have been recycling books for the weekday study for quite a while. Possible reasons that come to mind:
There is still a remaining stock of the book they want to get rid of. I think that is the main reason they studied the Revelation book like 666 times.
They don't have any other book available (to save money they haven't printed many books recently)
They can't think of anything to write about. The writing staff is mostly laid off.
They are afraid to produce any actual 'meat' for the flock. A sensible commentary like the one on James would be a benefit to everyone, but of course that will never happen again.
They are leading up to discontinuing the weekday study. Does it really make sense to have one meeting and call it three? It's a joke.