Street Photography

I've been surfing the tinternet and youtube and watching and listening to a lot of 'street' photographers on WNYC. All trying to define street photography.. Why would you wanna do that? what's the purpose? they all made a name for themselves by being different and unique so why should they be one way of shooting in the street? big egos maybe?! although i like their photography, listening to them was a great bore!! apart from this one... where's the love?