Here some info I just gathered for the Paid Postie People. Interesting indeed.

Hello and thanks for all your great work with us S*****.

There have been some recent changes that Google have made with regard to sponsored postings.
S***** would like to offer you some advice on this issue. Google has primarily targeted PayPerPost member blogs and reduced their Page ranks across the board. Although this WILL NOT REDUCE your rankings or readership, your blog will receive more campaign offers if it has a higher page rank. To prevent any future loss of page rank due to this issue you can take the following steps: