Listening to a tire company that promotes rotating tires unnecessarily (ie ones that are wearing evenly) is like listening to a motor oil company that tells you you should change it more frequently than the engine actually requires. It is in their own interest, not the consumer's.

Ever rotated brake pads? Same theory. You could get longer life. But braking would be compromised, you would get increased noise, and if the brake pads are wearing evenly (ie no sticking calipers or slides) there isn't a reason to even consider it. Sort of like rotating tires.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue