Actually I'm going to have a username change period in a couple of days. It will last for around a week and users can change their names on a first-come, first-served basis. After the week is up, we're closing the requests again. I'll post in the site hq when it happens.
Your example on your wig is a good one - you'd be perfectly ok posting it in the marketplace. The "new items" rule is to discourage resellers from using the service, but if you bought something and just haven't worn it it's still "used" in theory. We'll be able to tell the difference between someone just selling an unopened item and someone selling dozens of them.