A classic British mystery

Man, I don't understand the English. Apparently, two of England's biggest newspapers (the left-wing Guardian and the right-wing Daily Mail) are all up in arms over Pippa Middleton's plans to publish a book on event planning. Now, I don't really follow the coverage of Britain's royal family, but... isn't this woman an event planner? So why is the idea of her writing a book about event planning—not a tell-all about, say, the Queen's secret predilection for Ugg boots and Starbucks Frappuccinos—so horrifying? I get the claims of nepotism and all, but I totally fail to see what sacred law of Good Taste this woman's book is breaking.