The whole issue of bikes vs. cars is kind of a moot point IMO. Sure its fun, but they are two totally different animals.
Ive raced quite a few in my Nova, only in a straight line and mostly from a stop to about 100mph or so. Ive beaten a few and have been beaten by a few. I remember racing one really fast bike, which beat me and after the race the rider said, "Im faster." My reply was, "yes, but I was drinking coffee and blasting the stereo during the race."

Not to say I would have won if I hadnt, just commenting on the differences between the two vehicles.
I am always kind of nervous racing bikes though because I feel that if the rider crashed during the race, it is in someway my fault and I wouldnt like to see that go down due to a race I participated in.