There are some copyright issues whether one charges money or not. If Cyan allows their IP into the public domain they lose rights to it. So, while charging money is a certain violation, it is not the only consideration.
And Dachannien's point about client side is valid... if we serve only to those with Uru/CC/PoTS CD's... that limits the audience. Seems to me there would be no way to get anyone MOUL content without serious copyright problems.
Has anyone looked at RealXtend as an alternative? Or OpenSIM? I see a few comments from T_S_Kimball on OpenSIM. Nothing on RealXtend. OpenSIM would allow fans to run their own servers and connect them together via a shared grid. I think with both of these the land surface mesh is the complex import. But RealXtend and OpenSIM claim Blender compatibility... so it is likely possible.
If one is too move away from Cyan... add in world build, permissions, better AV's etc., why not completely move away to to a system that appears to be where the tech is moving toward? One with things many would like to add?