My feeling on it, as a merchant, is that if people have paid for my product, that's all the credit I need. Sure, it's nice when you see someone credit you, but I don't think people should be obligated to credit a Poser merchant any more than I would feel obligated to credit Staedtler when using their pencils to do a drawing. If people ask what I used for a certain Poser project, I'll tell them, just like I would if they asked what kind of pencils I use. Free stuff is another matter entirely. I always give credit when using an item I've downloaded for free (whether it be a freebie download or a gift from a fellow merchant), because in those cases, credit is the only payment the creator receives.