Just implement a tag that people can filter on to see only NPW images if they want.

Ultimately, you do what makes you happy. If you're totally satisfied with a NPW image then great. If you leave it lacking something that PW could achieve then it becomes either a fetish or an interesting exercise, depending on your POV. 

What I'd like to see is something like the lighting challenges at

http://www.3drender.com/challenges/index.htm 

where some talented people took a stock scene and had a go at it., with or without PW and especially some before and after PW images. It's sometimes difficult to see what PW contributes without seeing the same scene with and without it.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken