europeforvisitors - 6:45 pm on Aug 7, 2004 (gmt 0)
They would only need to check each domain in the adsense program once or twice in the year. That's not that much work, takes only 30 seconds per domain and would rise the qualtiy of adsense sites extremely.
A single AdSense account can cover any number of domains, and publishers don't need permission to use their AdSense code on new domains. This makes it easier for publishers to crank out new "made for AdSense" sites (at least until they get caught).