Four Continents was not only on the same continent but in the same city 2 years in a row (2005-6 Colorado Springs)? Wow. That does seem unfair - to the other 3 continents!
I'd call Colorado Springs Mid-West, but I do agree that the West Coast has had the lion's share of US competition since 2000. Even more if you count SC 2006 and FCC in 2009 (and of course the Olys). But I'm not complaining!