Because there is no other good alternative.
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Ben, quit lying. All your stuff is pink.
LOL, Color Drag ...The actual reason for choosing black gear is to facilitate optimal streamlining and minimalization. The "color" black is actually the absence of all color. Since color doesn't bring anything to the dive why lug it around? By utilizing black we eliminate unneccesary drag and clutter caused by non-blackness, thereby maximizing safety, efficiency and enjoyment.
I had to buy some orange florescent gloves just to be different,also helps my buddies to see hand signals.