I drive with -2.5 degrees front and -1.5 degrees rear camber, zero toe all around. I find the tire wear to be acceptible, if not great.... but I also do lots of autocrossing to keep the outsides of the tires wearing just about as fast as the insides. Something to keep in mind is that too much toe angle can kill off tires just as fast as camber, and toe is generally screwed up too when you lower a car... so regardless, you need an allignment.

do you need a camber kit? no. should you have one? not a bad idea... especially if you spend a lot of time on the highway. If you haven't gotten one, get an allignment. Then just get a camber kit when you can afford it, its not too urgent.

 

Good point that should be clarified...toe wil leat your tires way faster than camber. The point of going and getting an alignment isnt just to see your specs, but for them to adjust your toe. Thats why you MUST get an alignment after a drastic suspension change.