Elvis What Happened, was a true book. While it may not garner the favour of some Elvis fans due to it's blunt honesty, it was true.
It's very hard to argue that by 76'/77' Elvis was the same as 68'/69'. He was dependent on prescription medication, clinically depressed and his body was nearing the end of it's life cycle. How he ever managed to give some shows in the late 70's is beyond me. He was also using cocaine to an extent that the Elvis from only a few years earlier would of found abhorent.
Elvis reacted so badly to it, because he knew it was true.
I do believe they wrote it to make money - they had no jobs. Yes it was sensationalist - but that's what sells. If they wrote a book about Elvis being a quiet shy, humble country boy they would not have sold half as many books.
I am looking forward to reading the book.