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The Boxster has a lot of weight on the rear tires. On top of that, you're probably running a lot more negative camber due to your lowering springs. These two things add up to fast tire wear.
I wore out my rears in 10K miles at stock height. Unfortunately, as a daily driver, a lot of my miles are straight and on the freeway. A lot of negative camber is good for the twisties but bad for straight line.
I don't know what the factory camber settings are, but if you do a lot of straight line driving I would suggest no more than 1.5 degrees negative. Due to the Boxster using a Mac strut design, this might not be possible when the car is lowered.
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