You'll notice a lot of the pages in this book consist of things being cut out or stuck in. A blank page can be a bit intimidating, but I find them even more intimidating in a sketchbook. It's one thing if a loose page doesn't turn out right - I can just throw it away. But if I do that on a page of a sketchbook it can feel like I've ruined the whole book.
I know that probably sounds silly. It's not that big of a deal. But its definitely something that holds me back a bit.