there's tons of stuff here that wouldn't sell at DAZ because it is too creative.  if they can't imagine a market for it, it gets turned down.  you make yet another v4 character, and if it's quality enough, it'll probably get in.  same goes for any standard v4 add-on.  but a lot of the people who make more unusual items either get turned down (or say they do), or have already sold here or other open markets and gathered enough of a following to show their products can be viable. 

if you notice, most of the fairly unusual stuff at DAZ has either been by established artists, a freebie at some point, or both.  one of the few exceptions, etujedi's griffin, was a huge long forum thread with lots of views and a high degree of interest before submission.