For what it's worth, here's a pure Poser 5 render that I did for Banished, my collab with voodoo (Will Kramer). Of course, we then painted over it like mad, but you can still see many elements from the original render in the final piece. Most of the lighting was preserved, for instance.

I think it would be easier to create a Pure Poser gallery rather than try to force all the postworkers out of the Poser gallery. I have seen some wonderful pure Poser renders, but I can't stop myself from wanting to fix Poser models in post. Even the best renders usually have a nasty broken joint or something, and even my favorite hair models don't usually look natural in anything other than a standing pose. And it's easier to paint hair in the wind than it is to apply a wind deformer to strand based P5 hair.

Maybe, instead, there should be a pure render gallery in general.. I do see a lot of post in the Vue and Bryce galleries, for instance, with similar complaints about postwork in the related forums.