Users have been posting in topics telling people to "post in classifieds" or "wrong forum" since these forums were created. This is despite the clear note in the forum rules that instruct users to use the report function for such things.
These posts only cause clutter, and they don't actually help the problem get fixed. By reporting something instead of posting, you notify every moderator, who actually have power to fix the problem.
I have been PMing people who posted this way asking them to stop and warning them if they ignored me, but it is clear now that such a light touch has too little visibility or official weight. From now on, anyone who posts useless clutter/backseat moderator advice will receive a warning.