I agree with Holiday that they should be allowed to join and say their piece.
As a practical matter, they won't for a variety of reasons:
First and foremost, they think we're irrelevant. Their Ebay feedback rating is their core asset, which allows them to fleece newbies who never visit forums.
Second, they have nothing to gain, since most high-level collectors have made up their minds about them and won't buy posters from them.
Loce only noticed me because Bruce referenced me in his weekly newsletter and somebody on MOPO wrote about that article.
However, I'm sure they're surprised I'm not intimidated by their amateur litigation threats. They would be destroyed in court by any competent lawyer, of course. First thing you do is request all their purchase records from poster distributors and the game's over. Loce creates - and probably prints - most of his posters from images from MPDB and has no purchase records.
They've succeeded in intimidating everybody else to date because it would cost a non-lawyer thousands of dollars to defend against a defamation lawsuit. Not an issue with me.