Replace the 'business books' category with 'self help v2' and I think you will see how and why most of that crap is written. It's not about actually helping people it's about selling books, and because companies / peoples actual problems are way to complex to deal with in book form you end up with a lot of empty platitudes and a lot of random ideas.

After all what useful advice apply's to both Bank of America and a local gas station franchise. Or put another way what book would you hand a 14 year old genius trying to decide if they should skip a grade and a death row inmate?