I'm guessing Self-published Independent Authors.
There are a few questions regarding allowing non-Lulu members (Taff is undoubtedly an honourary Luluian due to his input to the Lulu forum, and he is, after all, a member of Lulu).
It would undoubtedly be good for exchanging ideas and for learning about other possibilities.
The main impetus for my starting the UK Wiki Lulu was so that the Lulu authors, artists,photographers and musicians could get some additional exposure, a shopfront over which thay had more control, and a chance to stand out when Lulu has such a vast array of content. Lulu is not particularly good when it comes to marketing and the wiki seemed like a possible option to help with this. More members would mean more visitors, but would also increase the risk of any one author's pages being harder to track down, and I would not want for the Lulu authors' pages to be swamped by the extra content, especially of those whose POD outlets are more effective with regard to marketing. These concerns apart I don't really have any objection.
I guess that it's really up to the members of this wiki as to who they want to join, and if the consensus is that other PODers should, then I would be ok with that. Personally, I am undecided at present.