Did they do Floriduh last year....if so how was the turn out? The closest to the NW this year was Thunderhill and it was a huge success! Portland last year, not so much.
I'd imagine they looked at last years numbers and feed back from multiple forums and than made the decision. New year new tracks, new regions....blah blah blah. I'd love to see an event in the NW next year. Oregon Raceway Park, the Ridge, Spokane, shoot even Pacific Raceway!
Let us know if they get back to you about the decision....if they don't, I know a guy who knows a guy that could probably find out.