An interesting idea but your preference for printed books, which I share to a certain extent, has a built in problem in today's computer environment. Things change so rapidly that by the time a book is written, gets printed, distributed, and into the user's hand it is out of date, perhaps badly out of date. For example there are recent threads in these forums abut the fact the standard technique of deleting preference files as a trouble shooting technique no longer works in Yosemite. At least with an online or eBook the cost and delay of printing can be eliminated.
