This tool is crap.
If you want to see how much money is your blog, try this (you will have an approximated result):
- go to technorati.com
- search your blog
- see how much authority u have
- search again 2 keywords to find a similar blog to your blog
- see his/her authority
- see how much money he/she is making by visualizing the traffic stats (if has any) and see what type of ads he/she has and the click values of the ads
The similar blog must be in the same language/country