Does having a high page rank mean you will get the traffic it deserves? The simple answer is no. I can have a high page rank and hardly any visits.  I could have high page rank, top adsense optimisation, with little traffic and make no money on my site.
A goal of your site shouldnt be to get high page rank.  Infact, a goal should be to get good traffic.  In turn, you will find that page rank will follow due to people linking to your interesting content.