I've always erased information after buying, selling or withdrawning gear, and will continue to do so simply as a precautionary measure, I've nothing to hide during a sale/purchase and I gladly give all information to potensial buyer/seller, but speaking from someone who has been burgled 3 times I do not wish to advertise a catolouge of things I've bought, sold or withdrawn, and for the same reason .. I don't list my gear on my signature!
the internet is a window to the world outside, it's full of people with no interest in buying, selling .. you wouldn't put a list of your living room contents in your front window would you? whats the difference!
with prices ever changing in the market place, left posts serve no purpose other than to feed nosey peoples curiosity,
If we lived in an ideal world then I wouldn't mind, but speak to any crime prevention officer as i have done on the few mentioned occasions.
kind regards
Chris