Some drivers ignore the fact that they're operating the car in a "severe service" environment: short commute (10 miles one-way), in slow or stop-and-go traffic, short errands on the weekend, etc. This requires more frequent oil changes, but, it's your car, and you can do with what you will.
The Service Interval Indicator was a response to European tree-huggers; stretching out the change interval tends to decrease the waste oil problem, as does "lifetime" fluids.
Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.