Complete and utter bobbins.
http://www.design911.co.uk/fu/pt66_202_-cma81-cmo539-ct541/Porsche/997-MKII--911--2009--/997-MKII--911--Carrera-S-2009--/Brake-Disc-Standard/
Fronts on a 997.2 C2S are £168.18 per corner for the disc, assuming you want the nice shiny Porsche ones. Rears are £151.83. OEM pads are £213 per axle. Hardly £1K per corner! Not forgetting that, much like Nissan, you'd never buy OEM when you can get an identical pad (as in made on the exact same line and just not stamped with the Porsche part number) for half the cost. My 911 was much cheaper on consumables than my 350Z was, barring oil at a service simply because it needed twice as much
Also, they don't crack often at all. What does happen is that the drilled holes become full of brake dust, and you need to drill them out, but then that happens with every single drilled disc in the world ever.