I was wondering about how this book became a "best-seller", like the media always claims? I mean, fans usually hate him and his book (and those who were still curious read it online to not to give him any money, LOL). I think fans will rather buy something like Taraborelli's biography (even if we have issues with him also), but not Halperin's. As for non-fans, I doubt so many non-fans bought Halperin's bio that it made it a best-seller.
I think the claim it was a "best-seller" is just as accurate as the claim about Halperin "predicting" Michael's death - these are the words of his self-promotion. And the media buys what he claims without any double-check, how sad!
It simply depends on the sale numbers and it was actually a best seller. It spend 4 weeks on the best seller list.
august 2, 2009 - most sold book for that week
http://www.hawes.com/2009/2009-08-02.pdf
and august 23,2009 - 4th week on the list and then it's no longer on the list.
http://www.hawes.com/2009/2009-08-23.pdf
and yes taraborelli's book is also a best seller. it made the list at its first release, as well as over several years when it was updated. it was again a best seller in 2009 - see the above links
http://www.hawes.com/1991/1991-06-02.pdf
Michael's own Moonwalk is also a best seller and spent 11 weeks on the list
http://www.hawes.com/1988/1988-05-08.pdf
http://www.hawes.com/1988/1988-07-17.pdf
In short stuff about Michael Jackson -good or bad - sells.