It's been my experience that a lot of "professional" artists make use of the cheaper tools, and just use a better rendering engine (such as a Renderman compliant one) in order to attain great results for a low price tag. I've even seen some of the artists use poser models in other applications, those would never in a million years fess up to the fact that they are taken from Poser. Yet, quietly still, they use the program, and the models that are both provided with it or available through stores such as DAZ.