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All true.  But since we will never know sales figures, we can only go based on the traffic we can see on the websites. 

 

Now we're getting somewhere. But, as you can see, those are somewhat equal:

http://www.quantcast.com/daz3d.com

http://www.quantcast.com/renderosity.com

 

OTOH, I check out both sites for things I want to see, buy, whatever... and I know I'm not alone.