I have four stances on this.
For the site, the focus on D&D is what lends it its identity. So that should always be the main theme.
For the casual forum-goer, conversations on
RPG collecting naturally filter off into other systems once in awhile. So it makes sense to have another forum to take the brunt - just avoid the threads you don't have an interest in.
For the reseller, knowledge of rares for as many systems as possible is helpful. I also end up with bizarre odds and ends that I can't identify.
As an
RPG collector, I collect Call of Cthulhu, Space 1889, Runequest, etc., but 90% of my focus is on D&D.
So that's 1 vote for D&D-exclusive, 2 votes for non-exclusive, and 1 torn up ballot due to internal confusion. Since the initial conversation was about pulling Changeling out of the main collecting forum, I think the intent is clear. But I could be wrong.