Because Murdoch would rattle the cage and get the gov to make them sell it off similar to bbc3 getting ditched to digital only due to funding cut backs. The BBC charter is for varied output and keeping the channels as such helps demonstrate it is targeting mainstream. I agree though a separate BBC sports channel would make sense but they probably can't afford to pay for enough to fill it.The whole of sport should be in its own section. I cannot understand why BBC1, BBC are used for football, tennis, Olympics etc., when with digital the BBC could allocate a BBC Sport channel or two like SKY and let non sports fans have alternative viewing during these events. Frequently the two main BBC channels are fully taken up with grown men punting a bladder around a field. BORING.