Page Rank Contradiction

Google page rank of this blog is now one. A pleasant enough achievement, considering its age was more than two years. In first six months its page rank rose to 2 but not long afterwards drove to n/a before then becomes 0 until yesterday.

 
According to some SEO's experts, Page rank reduction is caused by many factors, one of which is the paid post.  It is become a contradiction, because all pay per post providers requires a high page rank for article with a huge payment.

 

By the way, happy page rank 1 anyway.