Page ranking is still a mystery to me. I don't quite understand how Google calculate their rankings. However, I am happy if my blogs are getting ranked and sad when it losses it. This blog dropped down one level from the last time's ranking. I am hoping that on the next round of ranking, this blog would gain it back. I am crossing my fingers crossed.
Having a higher page ranks is advantageous especially if you are selling stuff as the content of your site crawls on the web dramatically and your site is sale-able. That is why some site owners are investing money on trusted SEO or search engine optimization services to increase or improve their marketing gains.
There are companies who specialize in this kind of service. They have tools that they can apply to your site that would boost your traffic through out the web. This is a good service to have if you have an online business.