It doesn't look so bad until you compare it with the rest of the club forums. The Nissan board I frequent is the same way- Arizona seems to have a good number of (web) wheelers.
Possibly related, the 80's Tech forums often have more posts in a given period then Chat . Why is that related? When we were out with the Toy Trail Team one of the guys mentioned that 'we must really like our 80's in Arizona, I've never seen so many on a trail run before'.