The Alexa Rank
 

The Alexa Rank is a ranking system which bases its ranking schema on the level of traffic each website receives from the number of people who visit a website with the Alexa toolbar installed.
Webmasters, advertisers and ad networks use your blog’s Alexa rank as a gauge to determine the worth of a link on your website. If you depend on link or site selling as a form of monetization you’ll definitely want to increase your Alexa rank, because it’ll increase your bargaining power when it comes to ad pricing.
Do you want to increase your Alexa Rank and to improve your overall earning. From the point of SEO its almost worthless to consider. But if you want to make money with your blog, then Alexa ranking plays an important role. Since its the only methods by which any advertiser can learn about your traffic, page-views, age group. If any one has premium membership, then he can explore your whole backlink profile. They can also learn about your top keywords. Overall their ranking system helps advertisers in many ways.