Just to clear up some things...
Firstly... Comprehensive NEVER covers auto accidents unless you hit an animal... its collision coverage that covers wrecks.
Secondly, while MOST insurance companies have a racing exclusion, not all do. When you first sign up you get a nice fat guide that spells out your policy for your state. it will tell you in there whether racing is covered or not, just look for "exclusions" in each section.
That said... Just because its not excluded doesnt mean they cant give you crap for it.. Insurance companies have a range of ways they can drop you depending on your state and if you have a shady company like Progressive they will make up a reason... So while Yes the accident can be covered in theory, They can also drop you when your policy ends for it, besides the fact its an at fault accident. As mentioned, State Farm will rip you a new one for racing (they told me that when i got my GN).
As for an insurance companies definition of racing... its VERY BROAD, so everyone theories about whether its a "speed contest" or not and blah blah are BS, basically the definition is broad enough that if they have a racing exclusion it could almost exclude an accident in the parking lot of a track... Basically if youre doing anything involving a car on the track and youre not driving the track dryer you are racing. They pay people a lot of money to figure this stuff out, they rarely miss anything.
So the possibility of an insurance company covering a racing wreck is Definitely true. If you go in blind without reading your policy you would be asking for trouble... AND even then even if they do cover it, you could be cruising toward being dropped, and TRUST ME its HARD to get a decent rate when you have whats considered an "at fault" accident on your record within the past 12 months.
As for Bishir's situation, I would reccomend againt the insurance route, in fact in all racing situations I prettymuch say suck it up because its not worth the risk... And anyone who reccomends saying it happened on the street, thats possibly the stupidest thing you can do... I have a friend who just got locked up for insurance fraud 4 months after he torched his car, you never know where there are security cameras, or otehr evidence, and anything suspicious they WILL INVESTIGATE.
Bishir if theres a video, IMO firstly contact the NHRA, contact the track, find out the exact rules for that day, YOU DO have legal ground to sue the driver and the track from what ive read... Small claims court can help you get SOMETHING out of this...