Ah ok. so it really has it purpose. Maybe I just took only into consideration the things which benefits me other than also taking into account that the website's value to the browser must be ranked so that they'll get the best when they search for something in Google. so it really does matter. Thanks for the explanation turkishhomes.
You are welcome Another factor you may want to consider is that Google takes PR into account when crawling sites. To quote Matt Cutts: “we crawl roughly in the order of PageRank, that means the more PageRank you have the faster you are likely to be found and more deeply we crawl your site and more often we visit your pages if they have been refreshed.†(source:http://techpatio.com/2009/search-engines/google/matt-cutts-google-crawls-pagerank-video-bloggers)