Because they are unique and easily remembered by potential customers. That is why good domain name may be very expensive. For example, domain name SEX.COM. Further, February 2015 Qihoo paid $17 million for 360.com. You can read more about domain values here. Good domain names are difficult to come by, too. This is why we periodically register some domain names which we consider should have HUGE development potentials for you. To send your offer to us within 5 days. The biggest offer will win.