I shave if I have to go to work that day, or to some kind of social outing where a neat appearance is the norm. (So if I'm just going grocery shopping on a Saturday, I won't bother to shave, but if I am going out do dinner with friends to someplace with real menus and tablecloths, I'll shave.)
I hate shaving. On the other hand, keeping a beard properly maintained and trimmed is a major pain in the posterior. And since I wear a goatee, I get to do both! 
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"Some mornings it's just not worth chewing through the leather straps." -- Emo Philips