I went there in 2006 when prices were at a peak. I am gonna say anybody that has a high end car that they have a ton of cash into won't brave that no-reserve auction. I wonder what the total dollar spent compares to from year to year.
I found it to be the best car show ever. Never been to Carlisle but it should be even better. Russo and steele ,which runs concurrently with BJ, had less cars but just as many desirable muscle cars.