The surcharge for static v4 addresses causes access network subscribers to purchase a second, frequently virtualized, "computer" through a "web hosting" provider, a duplicated cost where the access network is "always on" (aka "broadband"). There is reasonable correlation between domain registrations (ppc registrations ignored) and stable content and broadband as the access network of the registrants.
I don't think that the difficulty of getting a static v4 address for your home connection has much to do with the popularity of web hosting. My DSL has a static address (a real one, permanently assigned by the ISP) but I host my web sites elsewhere for reasons of bandwidth, stability, and not wanting to run noisy servers 24/7 in my office like I did back when I had a T1. Also, it's not at all obviousr to me that even for people who do want to run servers, what they would have to do with a consumer constituency. The vast majority of people I know have no interest in a 2LD. If they want to host something, they do so at Facebook or Blogspot or Flickr. R's, John