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Actually, kammbacks do create lift from the low-pressure zone above them created by the downward angle. The air fills up the gap generated as it moves through the air, causing the molecules to spread out more. If you take a look at the Honda Insight's wind-tunnel smoke testing, you'll see the gap widen between the surface and the smoke trail as you come to the rear edge, indacative of lowering pressure. Though if you added a kammback to, say, a 3 box sedan (fastback), you'd most likely see a reduction of rear lift, but it won't be eliminated.
The rear on that race car pictured would be more of a fastback, and I'm sure that ducktail spoiler adds quite a bit of drag with it's downforce.
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In Reason we Trust
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