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For what purpose would people publish their work here? 

If it is for critique, this seems like too public a forum for it. It will look like publication and that will make the work ineligible for publication elsewhere, at least until it is taken down. And if it is taken down, what happens to the comments on it and and reputation gained from the comments?

If it is a form of publication, then this seems like too unregulated a place for it. If there are no gatekeepers, then it would be useless as a publishing credit, while, again, making the work ineligible for publication elswhere.

If is is for vanity, then that seems at odds with the "professional" part of the charter of the group. 

Given this, I am not sure I understand the objective.