NBC is the network for Super Bowl XLIII.
CBS will be broadcasting the 2010 Super Bowl
Super Bowl XLV (45, the 2011 SB) is being broadcast on FOX.
The Television network that wins the Bid to broadcast the Super Bowl pays the NFL. The TV network makes their money through Commercials. The consumer that buys the products from the companies that buy commercial time for the Super Bowl pays for everything.
In the United States, the Super Bowl is being broadcast over 'free' TV on the FOX network.
The 2015 Super Bowl network has not yet been announced. Usually the Super Bowl will air on either FOX or CBS.