PDF Making CMS

The idea is about a Content Management System that allows an admin to publish the entire site as a pdf file. The admin in the interface, can choose which sections of the site will be used. How they will be structured and any additional text that could be used. (The pdf does not need to be same as the site).

The admin can keep an existing structure (order of pages and sections of the pages) and make changes to the site which would be reflected in the PDF.

Why would anyone want this? Informative sites can create a pdf of the site for easier readability..