The reason why TWC has many more hosted mods than the ORG is VERY, VERY simple.

The ORG reserves its hosted spaces to mods which actually want to have their development forums here, at least initially. Also because its such a small community mods with no intention of doing so sometimes get hosting because of org important team members.

TWC allows sites to use its hosting spaces as press conference areas. They don't insist people do any development there whatsoever- its just about the previews. Also since its such a large site they have loads of room to give a space to whatever two bit mod that wants one.