If one is interested in cultural property issues, one quickly notices that the archaeological blogosphere is full of highly moralistic denunciations of those who collect unproveanced artifacts, including those as common as coins.
One suspects this only carries over from the official pronouncements of archaeological groups like the Archaeological Institute of America. See http://www.archaeological.org/webinfo.php?page=10352
The AIA's website suggests that most of its ethical pronouncements relate to the perceived evils of the antiquities trade, and, indeed, they go so far as to suggest AIA members should inform the authorities about suspected illegal exports and imports of archaeological material. (In my opinion, this stricture may unfortunately be taken by some to authorize "witch hunts" for illicit antiquities.)
Archaeological groups are free to write their own ethical rules, but when those rules largely focus on the activities of others, outsiders are also entitled to wonder some about it.
In particular, why not more emphasis on requiring AIA members to:
"Seek to ensure that the exploration of archaeological sites be conducted according to the highest standards under the direct supervision of qualified personnel, and that the results of such research be made public."
Certainly, proper publication and conservation of archaeological artifacts is an important, but seemingly underemphasized issue, at least when it comes to the archaeological blogosphere. It is perhaps easier to criticize others outside of one's discipline, but if it is all about preserving the world's culture, isn't it also important for the archaeological community to monitor whether its own house is in order too?