I'm curious about this hudging books thing. Sounds kinda dirty.
Here's a quote from one of my favorite current writers, historian and archivist Paul Collins, on the subject, from his excellent memoir(ish) Sixpence House:
There is an implicit code that customers rely on. If a book cover has raised, lettering, metallic lettering, or raised metallic lettering, then it is telling the reader: Hello. I am an easy-to-read work on espionage, romance, a celebrity, and/or murder. To readers who do not care for such things, this lettering tells them: Hello. I am crap. Such books can use only glossy paper for the jacket; Serious Books can use glossy finish was well, but it is only Serious Books that are allowed to use matte finish.
He actually spends three pages going over the presentational minutiae of the modern book market, because in the book he's having an anxiety attack about the cover of his own first book. It's hilarious.