I don't think you should tempt people with free shit to get them to read. I'm sure more than the few individuals who responded to this post read Assata's biography.
I think you need to advertise the book better. Put it in GD or have Angiee always put it in the news so people know what's going on. I know a few people that say they just don't drop in on okayactivist too often. Yall already know the board is slow.
Everything else nappiness does is fine. Breaking the discussion up, just allowing people to throw out ideas, that's all cool.
The other thing could be people may feel intimidated about discussing a book. And for those individuals, you can't do nothing about them, just hope they read and eventually post.

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This life is temporary but the soul is eternal, separate the real from the lie, let me learn you. --Mos Def