I have an example not yet explored.
I recently uploaded an image with zero nudity.
The thumbnail had zero nudity.
BUT- the shadow generated by ambient occlusion gave some people the idea of a butt crack. as if the material were shear. But there is no transparency.
So- I uploaded another thumbnail, and directly emailed the forum coordinator a 200x200 revised thumbnail under 15KB.

That forum coordinator then uploaded a BADLY butchered 120x120 version of that very thumbnail to the gallery - with horrible JPEG artifacting.

Interesting...  Passive agressive behavior because I dared disagree? Hmmm...  
Here is the image in question:  http://www.renderosity.com/mod/gallery/index.php?image_id=1436691&member

If you look at my gallery, I have replaced the butchered thumbnail with the proper resolution and JPEG compression level.

So- how do these black and white analogies (smoking vs not smoking) apply when you wrongfully assign blame?  It isnt exactly possible in Poser to have transparencies without increasing the transparent level of the material to something above 0 now is it...

Just my personal experience yesterday/today...   

Is supporting PayPal really worth this hassle?