Sorry, OP-we continue off track.....
As an amateur reiner-I mean REALLY green, I have found that the NRHA is the LEAST intimidating of any discipline I have ever ridden in. They are extremely supportive of the beginners, and I have never seen such a nice, helpful group of people. I come from Hunter/jumper, so if you think reining is intimidating, try something else.
NRHA even has different levels of Greens, so that even tho all the greens run at the same time and are running the same pattern, there are 2 different levels being shown simultaneously. I ride in Green I, but am riding at the same time (same draw sequence) as the Green II's. Same goes for some of the other classes, which MAY be what is confusing? Perhaps someone here is not aware that 2 slightly different levels may be running together but awarded seperately?
Only time I have seen Pros ride with the ammies MAY be in the Green HORSE classes......perhaps? I know I have seen that, altho, we all put our pants on one leg at a time, and they can have a crappy ride on any given day also-especially on a greenie.......

(granted their odds are better than mine, but oh well) Doesn't bother me one bit, but I am kinda "over" folks being "famous", I guess.
All in all-I doubt they will be changing it anytime soon, so if you aren't happy, don't show in NRHA rated shows!