Back when mice were mainly used for pointing and the thought of having a dedicated one for gaming was merely a dream of Thresh, the way that manufacturers differentiated their gaming mice from the regular sort was to make them optical, black and add a click-able scroll wheel. Time rapidly moved on and optical mice were overtaken by laser mice, but still the "all black with loads of buttons" ethos continued. Indeed some mice are so bloated with buttons that it's become tough to find a way to hold them that doesn't lead to pressing 6 different ones at once.



Link: Overclock3D