It depends on suspension design. Some can tolerate the lowering better than others. It can be complicated when changing suspension bits for performance as compared to appearance. Both methods are cool with me though. Wear in the center might mean over pressured tires maybe. I lowered my Neon r/t with Teins about two inches and camber was fine.I dropped my wife's Jetta 2 inches over a year ago, the inside of the tires still look great and there are no aftermarket camber arms/plates on there. When I lowered my 350z 1.5 inches the tires wore out in the center like crazy and you could see the camber in the rear. I guess this would be a car specific thing.