I suppose it depends on how good of a writer you are.
Some writers can say things we all know so well that it's like we're finally understanding it for the first time. Some writers have a knack for delivering facts or prose with the perfect dose of humor; it's not what they say, but how they say it that is valuable.
I suppose the question of what merits a book has is more complicated than just "does this book push the envelope of human knowledge", huh?
Sometimes books are valued for their original informational content alone. Sometimes books are valued for conveniently anthologizing disparate works. Sometimes books are valued for the entertainment quality of the writing. This is a book which endeavors to offer information and context about a hot topic to a general audience in an informative but entertaining way. I can guarantee that you've spent over $30 on something less valuable.
I have a couple of books by Zach Weinersmith and they are entertaining and interesting.
I believe you're missing the point of this book. I also believe you're being a bit of a prat. I don't know, however, if those two things are connected.