Do you realise the pagerank you can see of a domain name is very very out of date? What webmasters get to see is TOOLBAR page rank which is very different to ACTUAL pagerank. Tool bar pr which we can see is a snippet of what a page once was. I have had sites update as pr4 and the following update are a pr0. It is far better when searching for links to find related links, even if the toolbar shows as a pr0 if it is a related link it is a good link. If you are searching for non related links then just bear in mind that you will need more non related to get higher in the serps than you would if they were all related. The reason pr is assigned so much weight is because sites that sell advertising try to egg people into buying the advertising by stating "we also have good pr meaning you get higher google" etc. I have it on good authority by an seo who is known to google employees that pr is a very over emphasised algorithm. Just remember it is one algorithm out of many. Don't base your seo efforts on pagerank that is out of date.