All the links I find in webmaster forums are bought based on the page rank of a site. What is the main reason behind it. A site with a good page rank might not be getting good visitors. For example, I have a site that is page rank 0 and gets about 200 uniques a day. Other site which is page rank 2 gets not more than 50 uniques. If people are buying links just for backlinks, they can do it through blog posting right? Whey spend so much money on a high PR site that doesn't have quality traffic? Can anyone please clarify that?