I recently posted here about a couple of new-old-stock Villiers engines that I knew were for sale elsewhere. Should I not have, then? (I understand the posting has resulted in a sale to a forum member.)
It's easy to say, "Oh, that was useful, because - unlike eBay - it was a little-known sale". But where is the line? And if I may not post about a "widely known" sale, how can I know its width?
I had, and have, for example, no knowledge at all about how widely-known the sale of those engines was.