I think that this is a great idea if for no other reason than it should cut down on the number of inexperienced people replying because they don't know any better; no one is going to be foolish enough to reply to 250 words of absolute garbage, and it would be much easier to mod would people copypasting junk.
Alternatively have ads need to be approved by someone first and trashed if they're not properly written but I know phasing that in is already in progress.
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