Will, HOD is pretty much all I instruct with now, there is no charge, in fact the last Thunderhill one they paid me $200 to do, so that can't be beat. I'll do Audi and BMW club, but BMW has only a couple of events a year and Audi still has the instructors paying half price, they do have a dedicated instructor run group though, and HOD is kind of a free for all, you get on the track during sessions you're not instructing.
I found this, it happened in your neck of the woods, look out for this one!!!
Wrecked Exotics McLaren MP4-12C
Jason