Good question. But think about it. People spend lots of time and money designed the covers of a book. Why? Because that is what will attract the customer to pick it up and find out more. If the cover is a little freaky and you aren't into freaky stuff, chances are you will walk right by and not take the time to find out what it is about. Same with people. Sure there are plenty of 'different' looking people who are very interesting. Some are just what they look like...odd. But you have to know that when you act or dress a certain way, people who don't know you will make observations by your 'cover'. If you were stranded on the highway in the middle of the night waiting for someone to pull over and help you...would you prefer a guy dressed in all black with tatoos, piercings and eyeliner to pull over? or the guy in the 3 piece suit? It's a comfort thing. Of course all your major serial killers are usually the bland guy next door. hmmm, guess it's a lose / lose.
