All that you have said is fully understandable, but I think it would be more reassuring if mods responded to despute threads just to say that they are aware of the situation and advising?
Obviously what goes on beween the mods and specific users is none of our business but as it stands as an outsider, it looks like we have a bad seller or a bad buyer (or both) who are free to continue in the marketplace as they please, which doesn't exactly inspire confidence.