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My experience, YMMV.
A Porsche guy who does frequent racing setups will know the effect of each end of the factory limits on handling, tire wear, mileage, etc. He can tune the car to be what you want it to be where the tire shop frequently can only get the settings somewhere into the spec range without knowing what effect each setting will have. Not saying it has to be a dealer, my guy was an indie.
I told him I wasn't out to race, I wanted even tire wear. The car had tires that were badly cupped, you could feel the unevenness easily with your hand. After his alignment, I took the new tires off at around 20k with plenty of tread even on the rears and even across the tread face only because they had reached their age limit in my eyes. He had set it up just as I wanted it to be.
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