For some reason, they chose a Kindle DX which is not book-like at all, and would have substantially larger pages. Why wouldn't they have just used normal Kindles?
People who read a lot like high word densities. I find the small size of the standard Kindle annoying. The DX is fairly close to the size of a hardback textbook.
I'm sad that it's still so expensive, though, especially since it has that dirty gray look compared to the newer e-ink readers.