I think if you have better PR of your site so it would be able to get much traffic to your site which is beneficial for your products.

you need to build more backlinks by submitting and posting your website to Directories, Social Bookmarking, Social Networking and of course Classified Ads here are the links.Web Directories,membegate.com,prdirectory.com ,web4url.com,alphaweblisting.com..

PageRank is Google's way of deciding a page's importance. It matters because it is one of the factors that determines a page's ranking in the search results. It isn't the only factor that Google uses to rank pages, but it is an important one.

It is just like that, when you ask someone to a best saloon and he preferred some best name to you. Same method is here if you will search about your niche keyword of site then search engine will give you some best sites related that keyword, if you site would have better PR so it would in first ten results.