Blue Fly, I know you feel really strongly that the dog dupe rule needs to be changed. You or anyone else can contact an admin to make your case. Last I checked with Athelas, he felt as well that we shouldn't have them on the forum. We held a vote when the rule was made and the community decided to not allow them. I don't mind answering questions about items I sell and their origins and I'm always transparent. Let's please not take my thread off course by turning this into a discussion on dog dupes. If you or anyone else feel you can do a better job as a moderator for the community, I encourage you to pursue that! I'm here as a unpaid volunteer and I'd be more than happy to pass my badge off to someone else if they get approved for the position.
Alright, the reasons I felt it was okay to post is...
1. They can no longer be obtained. There is no method to make more as the event is over.
2. It does not damage the value of any current EM items or is close enough in likeness either via name or graphic to be mistaken for a server birth or an existing EM item.
3. It was not created via a dupe.
4. They do not give an advantage to a player and are purely decorative.
Dog dupes damaged the value of the rares they copied by allowing items of the same graphic with colors that had not been available outside of those items. They were extremely destructive to the rares collecting community and some collections.
The default name exploit has many items that can be passed off as true rares or server births. There is a method still to create these I suspect.
As I recall those are the primary items outside of the banned items via EA that are not allowed on these forums.
There are many, many items on these forums that we allow that are past bug/exploits. Some examples of items commonly sold on these forums include sigil items, ranger ingots, golden blood moss, green clothing, the urn that says a small piece of blackrock, the lantern that says a weathered chest, gold mark scrolls, etc. These items were not intended by the Dev team to the best of my knowledge. The difference in my eyes is that they don't give any player an advantage over another, can not be confused with another item, did not have a negative effect on an existing item, to the best of my knowledge will not lead to action against your account, were not created using a dupe and can no longer be made. As I recall from the community discussion around the time of the last rares fest there wasn't a huge stink from the community regarding them.
If you have any further questions, please contact me via PM. Hope that helps answer your question. Perhaps the next moderator team will change the policy, but the above is the criteria I've always used when making a decision.