I know why, it's so simple and basic, you will hide your url only if you don't want to get reported, he was so blind to forget that AdSense is the same as Blogger, and staff out there can access both logs ... he is hiding his url and changing it because he buy cheap traffic from auto surfers and paid emails, putting only ads in a page with some trash text ... that's all I figured out, and may god forgive me if I am wrong .... anyway ask the man it's his method ....