I agree about the incorrect toe killing tires really quick because thats how i killed my first set they only lasted a year and totally bald.
if you have the right camber setting's your tires will last a lot longer then if your running a lot of camber from lowering your car, in time the inner corner of your tires will be worn and the outer will still have plenty of tread left, if you where running correct camber all of your tires would wear evenly,
well that how i understand it, correct me if i am wrong