That reminds me of the seemingly interminable Wikipedia 1.0 project. With that, the value comes from the incredible collection of knowledge being put down in physical form, not from its utility. I wonder what the value is in seeing snapshots of an ongoing and developing thing like a website, and how well it stacks up against the "real" thing.
Perhaps it didn't stack up and perhaps that is why I am not seeing the book option anymore. It was, sadly, the only form of monetization the site had (that I am aware of).