According to a comment on DigitalPoint forum, domain register has nothing to do with search engine ranking. Even the hosting company has nothing to do with it in most cases. Only when you geo target your site, local host “may” help a bit but only when the competition is tight.
http://forums.digitalpoint.com/showthread.php?t=1603045
The B2B marketplace is just becoming aware of the amazing advantages in forming an SEO Monopoly.