Mmmmm, strange. I have to say I found the opposite.
My AP discs were cracked to the edges like your pic within 5-6000 miles. Probably 1000 of those on track.
My first set of PF discs lasted 10-11000 miles. About 1500-1700 miles on track (mostly Ring laps).
My second set of PF's are still on the car. I think I've done 5000 miles on them, probably half on track, mostly Ring but at least 4 UK trackdays. They still look spot on and performed great again at Snetts last week. Look as if they'll easily last another 5000 of the same.
I think the differences in wear could be down to driving style.
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