I personally don't use Daz Studio, but when I do make something either free or for sale I try to get it tested in Daz Studio.  I am actually working on something I know will not work in D|S due to the materials in the prop. I have talked with one of my testers who uses only D|S to see if she can make a material for the prop to work.
I think it is up to the vendors to decide whether or not to support D|S or not to support Poser.

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