I have heard that a lot of people buy high Pr expiring domain names and i see a lot of them being available at some of the sites selling them. Even though a lot of domains have fake PR, i have still seen some which have real PR of 3-4. i also see many with 100s r even 1000s of backlinks. my question is that is there a catch. Have they been banned by google or something. if that is not the case how come they are available. pl enlighten me.