For what it is worth, I have always gotten better than average service from people with piercings.
The latest was at the Apple Store. My iPod died after a number of crashes. I suspect a lose internal coupling (since it came back to life in the middle of their checking it out when it got dropped on the counter). But they took excellent care of me, replaced it with an identical, but new, iPod and were professional and polite. As such things go, an excellent experience.
Strange, but everyone on the service end had lots of piercings, which actually made me feel calmer, given my experiences.