You can use Alexa.com to compare websites by traffic rank. NamePros is among the most-trafficked websites, and it's possibly the most-trafficked website, that offers specialized advertising in the domain industry.
We try our best to provide advertisers with value, and we believe that we're achieving that since most renew with us. Another good indication is that all of our paid ad positions are in use (most are full, but some still have rotation availability if you're interested).