I just do it all the time - I find it particularly helpful when a book I wish to read hasn't yet, or may never, be issued as an ebook.....
Then, you see, I am able to read it.
As I have not been given my inalienable right of Consumer Choice, which is a Bad Thing.
'Cept, of course, if I didn't want to read it, I could choose not to do so.......
Or not....