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I don't think it's bad business at all to use images of what people made using their product, as their business is a lot more then just character packs.

In that case the image should either be in a gallery or at the very least clearly labelled as an artists work. Including the image as part of the commercial Daz installer suggests to me that it is a commercial product. I've noticed that Daz also use other artist's work in banners on their site, but with no mention of what the characters are, so yes, I do think it is daft to show the characters with no indication of how anyone might acquire - at the very least - the base models for thier own work. In that sense it is surely not good business.

For example, what would be the point of a newbiie desiring to illustrate an anime character scene and thinking that all they needed was V4.2 , when they might be better advised to purchase the A3 figure. And I mention A3 because there's something suspiciously anime about the eyes on the above picture which makes me think it might be A3 instead of V4.