I have a really good friend who actually is making some decent supplemental income because he likes to buy expired domain names and use them make money off the existing traffic. I am not the biggest SEO expert here, but the way that he explained it to me actually made sense as to why he will buy expired domain names and use them for extra traffic. He told me that when you buy expired domain names they are typically from older domains that used to get lots of traffic as established websites that later went under or were shut down by the owners. What he likes to do with these types of domain extensions is something called ‘parking’ them. This is where he lets them sit as they are and puts some ads up on the pages that host the domains. Anytime that a person clicks on the ad that they see on the domain page he makes a few pennies. I can see how this adds up, because if you were to own say a few hundred domains, the pennies can really turn into some serious dollars every day.