DAZ isn't responsible for the language in the agreement because their content license arrangements haven't been unreasonably broad. DeviantArt is likely responsible for what's here because the site is owned by somebody that was once heavily involved in the recording industry which, as noted, has a history of excessively broad contracts that leave artists with nothing. Maybe you're comfortable with DAZ's integrity, but do you feel like granting DeviantArt and graphics card maker NVidia with the rights to go so far as to sell your work? That's the part that bothers me most because it doesn't sound as if it's just a matter of letting the images be used on whatever they want, but it appears they are taking the right to unilaterally sell the rights to somebody else forever and ever. I'm not a lawyer, so I'm not exactly sure that is what is being said, but I'd rather err on the side of caution. It does seem that this is written such that these images can go anywhere without any additional compensation, be it collections of artistic images, royalty free clip art collections, record covers, book covers, and anything else they can think of later or whoever they sublicense them to, or sell them to, can think of.

My visual indexes of Poser content are at http://www.sharecg.com/pf/rgagnon