I would guess that the majority of clients are "newbees"......it seems to me that the more experienced webmasters prefer other hosting and other registrars.
But everyone thats new to the net goes to Godaddy.
Must be a LOT of Newbies. Over 45 Million Domains at Godaddy.
The MAJORITY of domains are registered by companies and investors, NOT domainers or Webmasters.