"I`m the owner of poser-corner and all of you are right. 2D-Render can used commercial. I agree with you, but feechen, the merchant has the rights to say no."

and

"The final word of the manufacturer/copyright holder can befound in the Product's included README file.
The customer should make it a point to thoroughly read the README file contained in the shop's Product Description for
their own peace of mind. If no concrete rules for usage are contained in the README, then the Poser-Corner rules apply."

You state the site has a TOS allowing commercial renders but claim the merchant has the right to trump that? Considering that the readme's are translated and could be confused in the future, you need to take a stand one way or the other.

Do you allow your merchants to trump the TOS of the site or do you not? In my opinion you need to make a stand publicly at this point, simply stating that you've spoken to the merchant and what you've posted above doesn't make this clear enough. As a store you have a responsibility to your customers and potential customers and 99% of those customers won't make a purchase where the merchant wants to control their 2D render of a texture. Such a thing is ridiculous. I don't even have that restriction on my freebies.

...... Kendra