AS you may be aware, google is on a quest to penalyze the page rank from any site, blog that sells links or reviews. Many blogs with a google page rank of 4 went down to one or even 0!!!!!
The market is adjusting, and payperpost decided to create REAL RANK.
Every blog that has Payperpost plugin will track data to calculate your real rank, that will depend on your visitors and where they come from. This will benefit many bloggers and maybe it will be a more correct way to rank blog than PR. Unfortunately, many offer are still asking for page rank and not real rank. I think this will change as campaigns are revalidated.