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Heldring-
It's not.
Your saddle should be at a neutral angle, so you’re sitting on the middle portion, not sliding forwards on the nose or backwards off the rear of the saddle. The best way to achieve this is to use a spirit level, positioning it from the rear to the nose, and staring with a dead-level angle and then adjusting it if required, depending on the way your ride and your most comfortable position.
PepOne
Think the major problem is that people run most saddles too "flat" and are more inclined to run SMP saddles at the "correct" angle because they're such a nerd saddle and look so weird they accept the position is supposed to be like that.
Talked to a guy at Fizik once who said their saddles are meant to be run flat. And when he said flat he meant with the RAILS parallel to the floor. Depending on the model of fizik that's upto -8 degrees