Yes but the 87 people might not actually have paid for her book. Amazon have what they call The Vine and at 8pm every Thursday selected Amazon customers log on and they can claim up to 3 items to try for free on condition they review them. My friend is one of those selected customers and she showed me how it works. A lot of the items up for review are books and ebooks and she openly admitted she regularly gives the books to other people and simply makes up a good review.
I suspect a similar thing happens when people test/review items for the Beauty Bible, it's a way of getting a pile of beauty products cheaply.