Thanks! Re: books - it's hard to break out of market pricing, since books are common and there's a comparable product sitting on the shelf next to it (or a click away). With value-based pricing, some books should sell for thousands of dollars, but they don't - market pricing is too easy, so the price of books stays low.

Information products, on the other hand, often cover the same information at 10-100x the price, since market comparison is much more difficult.