i bought my car with very low mileage (29k?) as only the 2nd owner, and i take care of it well, even though it seems to hate me...
things i've replaced, off the top of my head;
clutch fan (twice)
drive belt(not a big deal, maintenance)
water heater valve
vanos seals replacement
splash shield\engine guard on the bottom of the car
both front left and right fender liners
both pre-cat o2 sensors
thermostat(maintenance too, since bmw makes another crucial cooling system part out of plastic)
valve cover gasket(maintenance)
forgot some others i'm sure
hood and moldings need to be repainted still
and this is all with less than 80,000 miles...