Fake page rank is a common SEO trick you should be aware of when doing a number of things from buying an attractive domain to buying page links or adverts.
Domains with a fake PR are often banned from being indexed by google but more immediately important is that many sellers will advertise the domain as PR7 for example to raise the price you pay for it. So that begs the question - How do you make sure you are not caught out?
Here is a
fake PR checker
KP