Those of you looking strictly at the price isn't looking at the actual performance benefit these rotors offer. Compare them to Performance Friction DirectDrive rotors, don't compare them to BMW "Performance" brake parts.
Also, I'm sure if there's a big enough "group" going here it'll drive the cost of development and manufacturing down a little. The expensive part of the process is machining the rotor hats from forged air-craft quality billet aluminum, if they can batch the rotors the cost comes down significantly than running a dozen at a time. I'd check and see if there's a bulk or group buy discount available.
Lastly, even for street use only these rotors will likely last you 3-5 times longer than the typical 1 piece solid BMW rotors, and if you do a lot of high performance driving, that 3-5X longer life will net you back the $$$ very quickly.
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