I think, to first order, the issue is time. Watch a new user visit the site and you will see what I am getting at when I say there are too many hurdles to overcome. We are extremely guarded when it comes to our time. The first hint of the possibility of having to solve a problem (no matter how small it is) that is not guaranteed to check something off our to-do list puts us in fight-or-flight mode.
So how do we get a new user to post and answer a question without ever asking themselves, "OK, what do I do now?" Because the answer will be: something else.
I suggest making a tutorial that walks a new user through the whole process once.
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