There's weight, and there's texture, matte covers and deckle edging:
These are critical choices in the creation of a book experience. They signal any number of aesthetic qualities about the book and its content. There's been a great resurgence of letterpress arts. Personally I love a the feel and look of a heavy card stock with deep impressions. It feels more real, more of this world.
Materials generally signify quality in a basic sense, but how do they help bring out more of the book itself? Are there situations where a matte cover is weird? Can a vellum dust jacket be used in any situation? You don't have to answer these specific questions, but I am curious about your experiences with texture and books. What do you prefer? What sort of snap judgments do you have about a certain material choices?