My opinion isn't based on experience, but I'm thinking the name only is worth reg cost x3 or <$30 roughly. However, if you look around you'll find sites and video tutorials about lighters and flints by Zippo enthusiasts. Believe it or not, lots of people hurt themselves changing flints and lighter fuel. Develop a site along those lines and the domain should be worth considerably more. The name is pretty good, it just needs to be propped up by an idea.