Hi friends,
Google Page Rank has its own importance. If your site is having good PR , it means it is already listed in Google's good books as all websites want to get ranked on top of the Google so, Google has its own criteria of giving importance to websites.
The main benefit of Google Page Rank is that, it just tell us the reputation of our site in user's point of view, it is only increase bye Google when ever the the reputation and demand of any particular site increased by people that time , Page Rank Matter,