Take a page from FFXI, maybe. Moghouses. Move everyone's existing houses into instanced places, if they have the gil to upgrade from small to medium to large, let them. The 'exclusive' popular plots were cool, really neat, but not worth this hassle. Most wards, sadly, are dead, even on big servers like Balmung. Think of it like a private room, but a whole ...house and yard. Yeah? No? This suggestion has probably been made a billion times.