One is read, replied to or ignored: on the basis of CONTENT of posts. And while that content may vary from the ludicrous to the profound -if we're lucky- it's nonsense to speak of "a Right to be here", except in terms of its negative: on only a few occasions have we had to face the issue of expulsion. If someone proves to have little of interest to say, then there will eventually be few or no replies. Don't need no stinkin 'procedures' 99+% of the time. Call it benign anarchy.
While it's true that any script kiddie *might* drop in here - as occurred in Episode XVIII of an earlier Norm flameout.. when he invited over some brain dead Mac VS non-Mac VS {absence of intelligent thought #1} idiocy:
It was made clear that these children could NOT bring in their mondo-graphic sigs, inane balderdash - and play here.
There's consensus that - nobody wants to get into Throwing People Out.. unless and until they become a palpably disruptive irritant (and no: there is no algorithm for setting forth all the possible things that might mean).
As has been suggested in this thread - CONTENT [on SOME topic] is the common denominator of 'approval'. Also said, the original nucleus formed in the IW technical forum - mainly around 'IT' matters, but often with oblique refs to quite different things. Little interest in pop psych (I observe over the years) - to name just one obv topic that produces ZZZzzzzs. This is not "a support group" for any and all comers; accomodate the moods and wit of the participants or don't; whining earns eBay negative feedback.
Anything from aardvarks to Zoroaster can.. work; nobody can show someone else how "to Be 'Interesting'", y'know? Obviously, minute attention to "procedures" won't do it. (And as you've noticed, "psych / therapy" appears to be interesting only as an object of scorn.)
HTH