If you are a writer and don't yet have the experience of hammering out your final jacket copy, you probably dread the prospect. Here's a book that took however long to write (seven years, in this case), and that required however many words to tell (about 100,000 words for this one), and you have to persuade strangers to buy the book by telling them everything they want to know about it in 200 words or less. Ack!
Fortunately for me, damcphail can explain where my attempts at cover copy are on target, where not, and why not. I get to propose what goes on the cover, and if I really wanted final say I could probably have it, but I have the benefit of a publicist who can say what, in her experience, moves people to buy books. Frankly, when it comes to selling a book, I'd rather have her experience than my intuition. That's what a publishing house, large or small, is for.