I wouldn't pay for a cryptocurrency book, there is so many information already in the internet...
Even this forum can teach you more than that book lol.
And it was released in dmr format, can't pay for it in cryptocurrency either, ironic huh?
Alot of information has been brought together into a nicely presented product. I am aware that much information is online, but there will be people who would like a piece of merchandise that puts many coins (one year old or more) in a historical context.
There are nicely presented sites and guides on cryptocurrency on the net, you just gotta find them...