it is because of a deal with fox for NASCAR. however, there is still plenty of real racing. they put nascar to fill in the schedulle so it looks like alot......but you still get pleanty(more then any other channel) coverage of F1, CART, Trams AM, SCCA, WRC, I think this year JGTC and BTCC.........
plus once in a while theres something exciting to watch, like the Legends of Motorsports