I can't not shave for more than a day, or two at the most. It just makes me feel dirty. I'm not judging anyone else, that's just how it is for me. My facial hair grows in fast and thick (I only wish that were true of my head ), so unless I want a beard (which I don't), I have to shave every day to avoid looking like a bum.

Footnote: I've been using the Gilette Mach III for a few years now. It is by far the best razor I've ever used. My barber can't give me a closer shave with a straight razor.