I had to stop reading one of my favorite authors when I was doing infant duty with my oldest. The books kept getting thicker, and I could no longer one hand them comfortably reading either end of the novel due to the book's balance. I found a kindle mostly solved my problems, and I could keep reading again one handed.

That said, it never occurred to me to just cut up my book, so I could continue to read it comfortably. I think I might have chosen to do so though, since I find the tactile nature of reading a physical book to be more memorable than digital. Where the words sit on the page, and the act of turning the page, the smell, all does something to my neurons. For my junk novels, I don't really care, but for the authors I cherish, the closer to the printed word I can get the better the experience I have, and the more memorable the writing in general.