Raven you do make some excellent points.
The only books that I've read that would fit into this category would be the ones by Dave Pelzer and it seems that since the success of those the market has exploded with similar books. It does seem in some respects like they're all jumping on the bandwagon, however because of the subject matter that probably isn't the best turn of phrase to use but I'm sure you know what I mean.
I'm sure they are very therapeutic to write from the authors point of view or then again would they? I personally would have thought that writing about your experiences could be even more detrimental to you, but maybe not.