I'd like to offer the suggestion that one reason could be because making stuff for Genesis is loads easier than making stuff for Vicky Four. Utilities like the the rigging and morph transfer tools take a lot of the grunt work out of making clothes for Genesis. There's also the fact that there are no undocumented problems in Daz like Poser's inability to save the geometry file properly requiring a goofy workaround. Maybe Poser could kinda get on this? If it where straight forward than maybe, just maybe more folks would make stuff for Vicky Four. Even though Daz is allergic to tutorials and has no concept of the phenomenon known as 'documentaion', it's still a lot easier to make stuff in Daz for Daz and Genesis. (A long time Poser user who also dabbles in Daz).