Same experience with me, dealers look at me like im not human when I drive into the service bay. Granted my M3 is completely track prepped with no cats, full cage and no interior. Still only has 11k miles...
After they come to grips that its still under warranty (and after some arguing) they do what they should and cover the car (or whats left). Its hard to find a good mechanic at a BMW dealership that accepts race cars. Porsche dealerships welcome them! Then again, far more porsches are tracked. Just another day at a bimmer dealer.