The pro's will be virtually non existent at this mileage for keeping FBMWSH.
I kept FBMWSH right up to 205k miles on my 530i.
Why?
Because it was just easier. The fixed price servicing on the older cars at main dealers is not expensive - its often no more expensive than an indy.
Plus you get a nice courtesy car and don't have to walk to the bus stop on a light industrial estate after dropping your car off.