You purchase a BMW for one
You purchase a BMW for one reason. Excellent car and everyone wants to own it or make one like it. If you cannot afford run flat don't buy a BMW. BMW are expensive compared to similar vehicles. You know that already. Why compare tire cost after the fact. I had a flat, (nail in the tire) was up north, drove 250K home. All I had to do was pulled over to the side of the road for about 30 seconds, system check the tire, press reset and start driving. The system inflated the tire as I drove and I was on my way home in minutes. This is what the new vehicle can do now. It inflates the tire for you as you drive, keeping the pressure you require. The convenience of not getting out of my vehicle on a freeway, the safety and the time it took me to press a button to be on my way....cost me $380.00....I will pay that any day anytime for a new tire rather than being stuck on freeway at 9pm at night on freeway changing a spare or waiting. Time is money and $380.00 is nothing for the convenience. Moral of the story, if you cannot afford a BMW don’t buy it.