Originally Posted by PornMD

Search volume of the domain's term if it doesn't get much type-in. CPC of the term can be relevant too. Those are usually the metrics I give people along with age and traffic if any. There are people who only buy names with existing traffic/earnings and then there are the smarter people that understand they can get more value for their money by buying names with better search metrics for the same price and just doing the minimal development/SEO necessary to rank for the domain's term given exact keyword matching domains (com/net/org) pwn SE's.