It's hard to say since we can't know for sure how many HBs there are. Are there a hundred of them, or is it just one guy with a hundred different false identities? The fact that they create so many sock puppet accounts tells us a lot about their level of honesty.
I think there are a comparatively small number of HBs around the internet generally, but some of them a very prolific, givng the impression that they are rife.
If you look at the number of HBs that turn up on ISF, its very small, and they usually get piled upon rather quickly.
I'm also convinced that there are far more HB usernames than their are users, and yes, I agree that Scott was very likely a sockpuppet of cosmored et al. The posting style was obvious.