It's not necessarily because dash-domains are bad, but out of the top million websites, domains containing a hyphen are less common among the more popular sites

It's not necessarily because dash-domains are bad, but out of the top million websites, domains containing a hyphen are less common among the more popular sites. See histogram at http://abznak.com/pub/20101228_dashdomain.png http://abznak.com/pub/20101228_dashdomain.png