I'll drive with my camber plates in +/- 2.5 degrees with no issue of premature wear on the streets. If you adjust the camber, you will impact the toe setting. I think thats a bigger factor in tire wear.
Parking Lot Hero
2008 WRX daily driver
2003 ZX3 23D Autox Car 42 FSP
"Hella Functional - Raced, Not Hard Parked"