I know its awesome, I love seeing him play like this! I'm guessing its because its so personal and alot about himself, I had goosebumps seeing this live on Wednesday... Great Show!
I love it when you see BJ, Mike and Jason White all kind of line up perfectly with their arms and heads totally synced. Awesome! Been a fan since 1994, seen them 7 times live, listened to every track 1000's of times but still get chills when seeing them play my favorite tracks old and new!
Probably because the crowds in America tends to be pretty boring compared to other parts of the world (statement based on both my own and others experiences). Since they are also traveling to the other side of earth they might feel like they want to do something special than in their home country
I've heard him say in an interview that other countries tend to let loose more and actually sing with him and he feeds off the energy from the crowds better