IMHO I am seeing too many non market topics being started in buy, sell, trade. I look there and topics are being started about appraisals or general topic domain threads. Shouldn't a mod move these and the member be given notice to post topics in the appropriate forum? It's just creating clutter. No one seems to care here.
Best thing to do if you see something out of place is to use the "Report" link. That will notify mods/admins.