Howwedrive.com posted a nice graph of time wasted because of rush hour congestion in some of our cities. Productivity is so high in America right now that meaningful gains are thin but expensive. If building or relocating my business, I bet I look longer at metrics like mobility and transportation flexibility than I used to in my decision cycle.
![nice graph of time wasted]("http://www.howwedrive.com/wp-content/uploads/2010/03/traffic-congestion-hours.jpg"){kind=link}
And if my business is building my region's capacity to compete, and I'm not in Seattle, I'm going to move that freakin' needle.
On the other hand, maybe people who work for Microsoft simply don't go home very often.