Some people choose to scan in their texts.
However, much depends on the quality of the original text, i.e, whether the typeface is readable by the scanning software, whether the copy is printed on good quality paper, etc. Often the amount of proofreading and editing involved is much more time-consuming than the user anticipates. Scanning a text brings up questions of copyright and fair use of a text. Even if the characters and words in the text have been recognized correctly, further work is needed to make a scanned text usable.