I noticed that the guidelines say primary purpose of advertising. A better result is to write a paragraph or two and then embed the video. The writing gives you content(and better contextual ads) and all of a sudden, the primary purpose of the site is your content, not the youtube videos. And therefore advertising revenue is not the primary purpose of embedding the videos. Which makes sense with adsense. They don't like MFA's and a site with only youtube videos and adsense looks like an MFA to me.
Thanks..I will add some content in each post. And..instead of embeding directly in my adsense site, can I create a new dummy site to embed all videos and link from my actual adsense site to the dummy site ? Is the linking videos be a problem ??