one can use Sanctum Arts products for commercial use.

one cannot make logos using the products or images that would be come trademarked by another company because the company would then have rights to the product and it's use, and only Sanctum Arts has that right.

Almost all Poser products have similar restrictions.  Daz has the same restrictions, from Daz3D EULA:

"DAZ gives no rights or warranties with regard to the use of any objects, names, trademarks, service marks, or works of authorship depicted in any 3-D Model(s) and the User must satisfy themselves that all necessary rights or consents that may be required for the User's particular use of a 3-D Model are obtained from the applicable third party(ies) owning or having rights in to such objects, names, trade marks, service marks, or works of authorship."

both EULA, Daz3D and Sanctum Arts have the same restrictions just worded a bit differently.

Sanctum Arts produces some of the best Poser models and products.  While some may have had problems with the way Sanctum Arts has done things in the past (3 years ago!) the poser community doesn't let a sleeping dog lay they like to beat dead horses (most of whom have never owned or will own one of their products).

I own several Sanctum Art products and have always been treated proffesionally by Mike and SanctumKitty.