The research on this isn't terribly easy! Perhaps it would be a great project for Sir Richard!
However, I did check, 6A, 5A, and 4A (3A is a bit harder as the wrestlers class is not part of the results info). Of those 3 classes, there were 20 seniors who qualified but did not attend the Senior Nationals.
Of course, they could of also qualified in the previous 3 years. My results were for 2006-2007 only!
A lot of times too I believe those that go to an event like Senior Nationals are hungry to wrestle in college and a good round here or there could really make a difference!
I know that Bo Maynes in the class of 1998 didn't go compete and he was never taken down or beat in Kansas! That year Scott Coleman of Manhattan went on to win Nationals at Sr. Nationals...
I honestly think class of 2008 is going to be one of those "special" classes to watch.