David, I agree with Robert. It's increasingly difficult finding dark skies is most of the US. Then you have to have the right conditions (ie clear night, new moon, etc). On top of that, you then have to find a great location with an interesting foreground and then time it right so that the MW is positioned right to make a compelling image. Ever since I took my first MW shot at the top of Haleakala in Maui, I so I eagerly want to recreate that experience and search out my next MW image.
Not to mention other negative factors like aircraft trails. If you shoot the MW in Yosemite before midnight, you're almost certain to have multiple aircraft light trails from aircraft going in and out of the SF Bay area.










