The Uru/MOUL/Open Source MOUL community seems to fall into three basic categories:
Social, Sandbox and Story.
Social are the people who are really into it for the hanging out, Sandbox are the people who want to tinker and build, Story are the people in it for the story and history. Within that there's lots of overlap of concept: people who want to build D'ni artifacts, or people who hang around discussing the notebooks in the Hall of Kings, or people pushing the limits of what their avatars can look like and having parties.
Each of those facets have their own expectations, their own cultures, their own wants and desires, and in some areas they blend, and some they don't.
Classic Venn Diagram, right?
Ever notice how a 3 ring Venn Diagram looks like a tree as seen from above?
The trunk, the strongest part of the tree, that which supports the entire structure, is in the area where all three of those facets; story, sandbox and social, come together. To be strong, the Tree needs a core place where all of those aspects can manifest in an equal, supported way.
From there, things branch out, into places where people are creating puzzles, and telling stories, and social events, and creating surreal ages, and having parties and playing with physics.
Everyone can build a home that meets their dream, and it is built on a foundation of a place where everyone is valued and welcome and a part of the Whole. And all of the branches, twigs and swirling leaves, can be accessed by climbing up that trunk. Or, you can be content to just sit in the shade, leaning up against the trunk watching the sun filter though, and that's just as good.