Antifreeze is like most other fluids in a car - you can't change them too often.
As per wanker, there is no "lifelong" coolant.
$22 sounds a bit high but it's not outrageous, especially at a dealership. Personally, I'd see if I could find a cheaper alternative.
I agree with what everybody else said about the run-flats - not a sports car thing. Fantastic for certain applications.
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