i ran 1.8 negative camber on my michelin PSS and im beginning to tell it and if i had to guess im around 12k miles on them. Ive heard their typical life span is 20k so not too bad. you can see that the inner part is a bit more worn than the outer but nothing dramatically crazy.
HOWEVER watch your toe. I ruined two tires last year up front because the last shop to give me alignment didnt set the toe right and i have two very nice and meaty PSS i had to throw away because the belt was showing on the inner most part of the wheel.