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The rear rotor usually dies first because Mazda programmed the fuel cut to the rear rotor when you hit the rev limiter. This causes the rear rotor to run lean, which leads to detonation, which leads to blown apex seals, which leads to "time for a rebuild."
As for the original question: I got 168,000 miles on my original motor before my oil seals on the sides of the rotors let go. The NA motors tend to be more reliable because theres not much you can do to screw them up. Its my belief that the turbo motors have an undeserved bad reputation due to owners making bad modifications: they up the boost without supplying sufficient fuel, and you end up with a lean condition. (See the 1st paragraph.)
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