I'm sure there are many reasons, some of those may include;
Travel Distance. Due to region play, Pinewood already has to make 3, 2 - 2 1/2 hour trips. Beaufort and Hilton Head twice.
Region tie breakers for some of these top schools.
They have to schedule 12 region matches each year.
There are some that would like to have better games, but with these factors above, it's hard. I'm sure if some of these other top 3A/4A schools would want to travel to Pinewood, it might make it easier. But I don't think that has been the case so far.
At the end of the day though, perhaps some of the difficulty they have in getting games with top teams is proof positive that they can compete outside of SCISA.
