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Actually, the film changes color from absorbing oil based pollutants.
Thus, washing your car often and the occasional waxing with a synthetic wax is a must for maximum longevity.
Besides, a little buffing with rubbing alcohol once a year really brings back the clarity and shine.
Not to mention, it's a wear product. If you're purchasing it thinking it lasts forever you will be disappointed. If you purchase it knowing it will protect your car for the next five to eight years and at that point needs to be replaced you'll be happy. Because in five years....your car will be rock chip free (or very close to it) and your friend's car won't be.
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