But what if they are contaminated, or they overflow and you have refill the airlock? What if your wife decides to turn the light bulb off and crashes your temperature in the closet? What if your beer NEEDS you?! 
I like smelling the airlock to see what the yeast is like. For instances, Wyeast Forbidden Fruit 3463 smells like ASS, no kidding, a cheese gut bomb, room-clearer (didn't like smelling that one). Wyeast 1056 American Ale is nice and clean, if a bit plasticy smelling at first. Etc.
It helps me get into that carboy and understand what's going on!
Plus, I have them all on my kitchen counter or sink with t-shirts over them to keep out the light...
I like smelling the airlock to see what the yeast is like. For instances, Wyeast Forbidden Fruit 3463 smells like ASS, no kidding, a cheese gut bomb, room-clearer (didn't like smelling that one). Wyeast 1056 American Ale is nice and clean, if a bit plasticy smelling at first. Etc.
It helps me get into that carboy and understand what's going on!
Plus, I have them all on my kitchen counter or sink with t-shirts over them to keep out the light...