2011 BMW 335XI Suspension Problems

I BOUGHT MY BMW 335I XDRIVE BRAND NEW...ORDERED IN JAN 2010 AND DELIVERED ON APRIL 19, 2010. SINCE I'VE HAD THE CAR, THE FRONT PASSENGER SIDE TIRE WAS REPLACED 3 TIMES (WITHIN 20,000 MILES) BECAUSE OF POTHOLE DAMAGE TO THE SIDEWALL OF THE TIRE. ALSO, THE CAR REQUIRED REALIGNMENT. IN AUGUST 2012, I HAD ABOUT 22,000 MILES ON MY CAR AND HAD TO REPLACE ALL OF MY TIRES ( EXCEPT THE PASSENGER SIDE LEFT FRONT, SINCE THAT WAS THE TIRE THAT WAS ALREADY REPLACED 3 TIMES PRIOR TO HAVING 22,000 MILES ON MY CAR) BECAUSE THEY WERE WORN OUT. THE BRIDGESTONE RUN-FLATS ARE EXPENSIVE FOR MY BMW. THE COST TO REPLACE ONE FRONT TIRE WAS $430. LUCKILY, I HAD PURCHASED THE TIRE WARRANTY WHEN I BOUGHT MY BMW. THE WARRANTY WAS $1,000. I FEEL I AM BEING RIPPED OFF THOUGH. WHY, AFTER SPENDING $60,000 ON A NEW BMW SHOULD I...