It's another superficial display that is suppose to imply dominance. It's the nigger version of oneupsmanship. Flashy clothes, a fancy ride, $200 sneakers, waving stacks of cash around, giving kids outlandish names and etc. are all done for the same effect, namely to proclaim that they (the niggers) matter and are important.

Niggers generally don't have the intellect or character to do things that actually matter -- like be an attentive parent, or keep their house and yard neat and in good repair -- so they have to fall back on these gaudy but insubstantial displays.