it's not as competitive at brooks. Also NXR was probably a lot of the top kids main focus and a select few get to go (just 5 unless you have a good team) So some kids went for top 5 and bombed the race when they realized they weren't going to make it. Brooks is a week later and I don't think all the top competitors who even had a chance went even after not making NXR. It's a lot of travel and resources and if you don't live in a state like NC where most the races take place it's not conventient to go back to back.