I kind of guess that is my point. The class is huge and there are lots more people out there that would like to run them but may not want to run mod with the pro's. I agree there are a lot of classes out there but there is only one 4wd class! There are 3 2wd and 3 truck classes! Why not 2 4wd classes?
I do agree with you in that watering down classes is not good for the hobby and I do not think this is a good idea for club racing but for large events with 70+ 4wd entries it might not hurt to see if you can get 20+ to run a different class. I don't see the harm in that?