The points break down for mains go:
Novice (NBL Rookie:
1st 60
2nd 50
3rd 40
4th 30
5th 20
6th 10
7th 8
8th 5
Intermediate (NBL Novice)
1st 120
2nd 100
3rd 80
4th 60
5th 40
6th 20
7th 15
8th 10
Expert/Girls/Cruiser
1st 240
2nd 200
3rd 160
4th 120
5th 80
6th 40
7th 30
8th 20
All do go for the same NAG plate but with the Experts getting more points (harder class) they usually get the plates. This gives the Intermediates and Novices something to move up for.
ROC and Redline cup plates are based on age and class, so Rookie, Novice and Experts all have their own #1 plate.
With the qualifying you will see that Opens are huge at the ABA evens. They have mixed opens for Novice, Intermediate and Girls and then Open for the Experts (mixed age).
I like because if I go out and do good in the first moto I know I am garaunteed to make it out of the motos. If I screw up in the first one I know I still have a chance in the second moto.
Plus with the way they do practice you get a good amount of track time.