Why do people buy newspapers and books? Physical calendars and reading materials lack the convenience of their electronic versions, but the physical presence is not completely worthless. In the case of a calendar, it's because I want to be able to scribble notes, color, etc....whatever note-scheme I decide on...and have it in my face, and anyone else's. Just like it's more comfortable to show off a physical photo album than to hand over your laptop to someone and have them browse your Facebook albums. Also, there's a little satisfaction in marking something down physically.