DMCal, there's a theory about new cars. The theory goes that you're more likely to have an accident in a new car than an old beat up car. This theory explains that because you're worrying too much about damaging the new car, that you're not relaxed, and it can affect your driving. Even if the accident wasn't your fault, the theory holds true, because your worry vibes spread around, and cause someone else to hit you.
A similar theory holds for expensive sunglasses, the only difference being price, not newness.