Some time ago, Audiogon started hiding the asking price when an item was sold, by replacing it with SOLD.
This is frustrating for people trying to do research on the going price of an item. In doing research, I might google on "for sale DT880" and google will show me old audiogon pages as well as old posts on "for sale" forums. Most of the audiogon pages will have the price hidden.
They deliberately want to frustrate you. They want you to pay money to buy their blue book service.
Now, I've noticed people on head-fi doing the same thing. They will edit their post to replace the price with "SOLD." I don't know if they are doing this just to imitate Audiogon, but why? They are killing the research. What is the need for this? Why not just put SOLD at the top of the post and leave the price intact?