Sorry to disappoint with the thread title. Indicators to me are: Cheap price Use of text speak when selling something 'grown-up' Single post only OR posters who only sell stuff but always make out they have a personal reason for selling Arranging to exchange goods in the pub or away from home Nothing definitive here, just some suspicions, and it's an industry I'm loathe to support I wonder if people who buy and sell as a business should be made to indicate this; this would separate them out from the fences.