Snoots. I am sure you know how the Opensim platform code works. It simulates a grid map to which virtual regions can be connected and located by coordinates. Thus, a grid can have one or very many regions. It doesn't need any more definition than that but I rather suspect all this questioning you are doing is just a subtle attempt to diminish the significant's of the Open Metaverse in comparison to a closed commercial grid like Inworldz which, of course, is your virtual home. It doesn't matter whether a small standalone grid has one or a hundred supporters because the fact that it exists at all represents a virtual presence in the Metaverse.
If you come clean and say what you really mean, Snoots then we can get to your point which is that you think people are wasting their time with these back street garage outfits when Inworldz offers a highly developed world - at a price - that really deserves to be called a grid. You don't see any point in hypergrid connectivity and you will readily dismiss it as insecure I'm sure. Inworldz exists behind an iron curtain like Second Life of course and content is very secure (is it?). Inworldz has the largest active community you will argue no doubt. You will dismiss the, collectively, larger community of inter connecting grids that represents the free Metaverse I'm equally sure. Fact is though a whole bunch of people disagree with you and are not interested in paying for Inworldz closed grid services simply because they are enjoying lower costs and the freedom to travel the Metaverse to meet up with friends here there and every where on their own little grids. The Metaverse is just like the 2D web in 3D form really. People can click a teleport link just like a web link and be taken to the new location on another grid. This makes it possible for lots of small grids like web pages to form their own connections and communities without meeting the excessive charges levied by close monopolies like Second Life. Inworldz might have made some great advances but so too has Opensim which serves via it's hypergrid protocol to bring together both large and small worlds including all those rubbishy little garage outfits people build with pride and joy.