I think a test case needs to be bought over things like this. In UK law, I believe that virtually everything is covered by a "reasonable expectations" clause (my terminology, and I THINK i'm right, though I may be talking out of my backside) i.e. If you went out and bought a car (the sole purpose of which is to transport you from one place to another) and it said in the very small print, buried on page 24 of the EULA that you were only allowed to sit in your car in your driveway, and NOT use it to go to the shops in, then in court this would be thrown out as "the sole purpose of a car is to transport you from one place to another" and the EULA is not in accordance with reasonable expectations of the product.
A good lawyer would argue that if you create 3D content in one piece of software, then it would be reasonable to be able to use that 3D object in another piece of 3D software, as it would have virtually no use on its own. (lets be honest, a large amount of "finished" 3d work has been through a number of pieces of different software to get to that finished state) I'm wondering if you take your stuff out of DAZ software through poseray etc, into TG as an OBJ and then out of TG as a TGO would the EULA still be valid, as a TGO file can't be edited by DAZ software, or uploaded to the DAZ store for use in DAZ software. It has essentially become a "Stand alone" product and therefore no longer a derivative work!
Also, why not ask where you can add your TGO files to the DAZ store and see what they say. I'm wondering if you can set a price of $0 for your work when you publish it to the DAZ store?
Just my demented ramblings on the subject