Ok. I guess I am familiar with ATI's business model far more than Nvidia's (for reasons I won't get into to) and didn't realize there were such significant differences.
Zero. You'll not find a single nVidia graphics card under their own name.
True, but a lot of brands don't do much more than rebadge the reference design. I don't know exactly how this works business wise, but if they buy unbranded cards directly from Nvidia there might still be profit in it.