Why? I am a scientist; Masters Degree in Biology and a medical student, so I feel I am fairly qualified to respond to this. Here's some general background: the cartilage in the ear auricle is a thin layer of elastic cartilage, which is why when you fold down your ear, it doesn't stay that way; it bounces back. Cartilage gets very little blood supply, so any damage to cartilage heals very slowly and with much difficulty, since the nutrients and oxygen found in blood is what helps tissue to repair. The non-cartilaginous aspect of the ear auricle (i.e. the earlobe) is made of fat, which is just loose connective tissue.
Many times (I don't think nearly as often as the OP is suggesting though), using a piercing-gun on the thin elastic cartilage of the ear can cause small micro-fractures that resonate away from the spot where the stud pierced (since studs are relatively dull, especially when compared to needles). And as I mentioned, cartilage doesn't receive a great blood supply, so these micro-fractures don't heal very easily at all.
Cartilage doesn't shatter the same way bone (or a vase) does, but since cartilage doesn't heal the way bone does (bone has an enormous supply of blood), any fractured damage to it is considered shattering.
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