But why?

Two of the pages in a letter I just got had this printed on them: ‘this page has been left blank intentionally’.

Why? that’s two sides, a whole page left blank, but it isn’t blank is it? It has ink on it! And why not start a new section on the back of the page where this is written? I wonder how many thousands of pages are wasted. How many trees it would save? Make text 1 font size smaller. See how much that would save. And if the page is meant to be blank, leave it blank, to save ink!