My Page Rank

Guess what? I have just checked my other website’s page rank and unfortunately it goes down, I did not expect it to be happened. But one reason I suspect it’s because of my numerous paid posts made. I thought it will be going to up after weeks but my expectation does not happen, in fact I only had more than zero page rank for about a month, very sad. Hoping it would increase again soon. Have you experienced like this before? Now I learn a lesson, posting lots of paid post could affect your Google page rank, so I think you must have a ratio of 2:2 for paid post and unpaid post. So if you have the same problem like mine, the best thing we do is to make more unsponsored posts than paid posts, the more you have the more your Google index up. This way you can build more traffic!