There are many site rankings out there and this includes rankings such as Alexa rank, Google Page Rank, and others. Some webmasters are very determined to raise their rankings any way possible. It can be nice to be ranked well, but ultimately your site is worth as much to someone as much as he visits your site. You can have a site that is not ranked very well, but if your visitors enjoy visiting it, then there is nothing wrong with it. Also, each rank may rank your site in a completely different way. According to one rank your site may be ranked very well, while another rank will rank your site pretty badly. What I am saying is that most ranks are not very reliable.