Rick, Id have to guess on the lack of attendance from the bay area guys. Perhaps...
10) lots of graduations on or around that weekend,
09) prime golf time, lots of other events close to home,
08) some may work for "the man" and could not get vacation,
07) 18 hour round trip (driveing time),
06)wife or other said "NO",
05)the roads in OR are too pretty and you cant hit the apex and see the scenics at the same time,
04) other events such as the Shriners Concours (porsche speedster featured car)
03) some folks did not want to camp and they don't realize there is a nice hotel within 3 miles
02) it is too hot to drive through Redding with the top down,
and the number 1 reason that more are not drivintg to the Parts Obsolete Campout is....
01) There will be too many ORIGNIAL PORSCHES and we only have "kit cars" and they dont want to deal with the SNOBS, sniff.
Actually, if there is a non-snobby group, this is the place/event. A great time to get out and represent.