That's likely true. Why send away 3D hobbyists disillusioned and unhappy? Especially since these are the very 3D hobbyists spending the most money on products. They see the luscious promotional images on product pages and think, "If only I had more stuff in my runtime, I could do renders like that!" It's a natural thought, and one that vendors encourage, I would think.

Of course the render is only half the battle (OK maybe more than half) for such images. Then comes postwork!