Paper is cumbersome to deal with when it is great quantities but many people still find it helpful (comforting?) to have documents printed on paper instead of reading them in electronic forms.
As you have noticed by now, I am involved with the NFSv4.1 effort and the resultant document which is currently at 464 pages. While a great majority of those NFS engineers interested in this document will opt for either a soft copy or the html formatted version there are those engineers that like to have a stack of paper to inspect.
Well, printing the 464 pages on your printer is likely a hassle; toss in getting the pagination correct or binding the result then it is a real pain. The audience for this type of technical document is very limited. The audience is limited even further given that the protocol is still evolving. How does one get something like this easily printed. Drop it off at Kinko's? Maybe. How do you share the result with your engineering buddies? Especially when they are spread around the world? Well, one example is cafepress.com (I am sure there are others but this is the one I bumped into first).
Create a simple account and resultant store, upload a PDF of your document in the page size that is preferable for your material, generate a little cover art and voila -- you have your own NFSv4.1 Draft 10 Book. Printed, bound, and shipped to your door. What a great deal!
In my particular case, I am not in it for the money. Just the convenience. The resultant price is the cost charged by cafepress.com and there is a nominal shipping fee. Very cool and helpful to the 12 or so NFSv4.1 friends that really care.
And yes, I chose the genre for the book very late at night with little patience for choosing something more appropriate.