Its best for adsnese but you should manage it for long. Add good quality articles, do link building and much more before you can actually earn from it.
You need to learn too much... Post unique content, choose right ad positions and derive traffic to ur blogs by ethical and permitted means...
pagerank will not affect to your adsense earnings, just improve your traffic and optimize your ads placement. .your earning will increase little by little
If you've placed the adds in appropriate places, then of course its fine. Question is though, are you actually getting traffic?
Adsense has a success in blogs. In fact I know a lot of people or bloggers who were successful on their adsense campaign making $1000 - $2000 per month. I believe that you should position your adsense very well. I suggest that you put it on the top of the content, not on the left or right side bar of your web because people nowadays are train to read on the middle position or were the content is. Another thing, you should generate more traffic to your website
that's the mistake everyone do don't think about earning. think about giving good content and quality posts. try to get visitors. then go for earning.