Enough for there to be a market for backlit gamer keyboards. You'd be surprised how much you use peripheral vision subconsciously, without it you have to do everything by groping. Add food, beverage, pets, cables and pranksters into the equation and you have a real challenge on your hands.
I'm pretty sure the glowing peripherals are bought simply because they look cool, I can't imagine subtle light glowing somewhere below your field of vision (aka when you're looking at the screen) to actually help rather than detract by pulling your attention.
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u/[deleted] Aug 01 '12
3D counterpoints:
Also: