check out adsense's new application process http://adsense.blogspot.com/2011/08/new-publisher-application-process.html A two-step process to approve the account?
Yes, that's because so many use a url to register and then use adsense code on another site. I think this way it simplify domain ownership check for adsense.
Finally a great move! Now do something about stopping "Click Bombing" and to avoid banning innocent publishers.