I've always wondered about the bolded too. I think that yeah, either "4bs" are less likely to go natural or
ladies with looser hair textures are highlighted and exposed to an extreme degree when compared to their counterparts (obviously the two possibilities are rooted in the same problem--that *bleeping* good hair slave mentality).
All that said, I have noticed that most hair blogs and forums are void of the tighter textured presence--there's one notable exception that I know of. Nappturality. There are some beautiful ladies over there. As for hair idols? Feast your eyes on NappyMia http://public.fotki.com/Nappyme/
She also has a blog: http://nappyme.wordpress.com/
I love her!