Why don't you pierce with a ear piercing gun or device?

First off see "Does a piercing hurt more with a needle or an Ear Piercing Gun?". The number one problem is sterilization and cross contamination prevention. Since they are made of porous plastic they can not be autoclaved and tend to collect containments. Since, often they are used over and over they present a health risk. They are only safe when they are one usage and even then their safety is in question. With needles everything can be autoclaved and sterile.

Ear piercing devise and the jewelry were only designed for the lobe of the ear. Actually the devices were originally designed for cattle tagging. The jewelry type makes cleaning the piercing very difficult and often doesn't allow enough room for swelling. Also the jewelry does not work well or at all in other places of the body like the upper ear cartilage and nostrils.