Whats with the rear camber on our X5's/X5Ms?

So i got my X5M about a year and a half ago and it had brand new tires on it. 18 months and 17k later the inside of the rears are basically bald. I had an alignment done back in january to hopefully slow the wear on the inside's but when i got the sheet showing the specs almost everything was in spec....yet the vehicle still has what appears to be a good amount of camber in the rear.



Is this normal? Do your guys rear's wear evenly?



I bought a new set of tires for the vehicle....but i want to be on top of this before i have them installed as i'm not ok with tires only lasting 15-20k because of uneven tire wear.



Any insight/suggestions are appreciated.