I don't think so, it's only a minority (most notorious?) with such a thing.

Obviously I/we can't produce a list of known locked out posters or those not so denied access. (Remember the old lists of things on the RT or were you not around then?)

There are some of the notables who pop in now and again and they're OK to post so why are they not posting regularly?

I think what's really turned off a lot of previous posters is the multitude of wanna-be commedians who seem to think it's fun to turn any thread ("serious" or not) in to a slap-stick routine either by making stupid remarks or posting stupid pics all of which have no bearing on the thread in question and couple that with personal comments/insults, direct or veiled and a lot of the reasons for not posting are there.