Well, I'll have to disagree. The Emanuels designed the gown, they did the work to create it, and they did not 'exploit' private memories of Diana, but confined themselves to sharing memories of the creation of the gown. The book was respectful, and beautifully done, and the silk remnants were offered to collectors who wanted a little something extra in memory of the Princess' wedding day.
It was the story of a beautiful and historic gown, not of the girl who wore it. They didn't make money off Diana, they made money off the gown they created. If anyone bought that book thinking it was about anything but the gown, they were disappointed.