Bluepixel - 5:44 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.
But I guess, they want those kind of sites in their programm, so they can make more money.