Most of the bloggers or website owner’s go for Google Adsense because they want to focus on their contents and leave the money making business to be handled by Google. If you are a Google fan, you would have Gmail, Analytics,
Feedburner, Webmaster tool etc with you. If you are maintaining these things along with your blog, then maintain the ads from google account itself. That makes the things easier for bloggers.
Internet Techies has provided the reasons behind using Google Adsense for online money making:
a) Very simple to use and integrated with other applications of google
b) Ads are relevant to the site content
c) Google search the dominated and strongest search engine player
d) Once you have a huge content, you will go for custom search of your blog. In that way you opt for Google Adsense because you integrate the Adsense with the custom search to generate the revenue.
e) There are so many examples available where people got the check from google
f) Google is a stable organization and is having a very prosperous future
Other players like Yahoo Publishing Network, Chitika, Amazon et are also good but still the Google Adsense has dominated the sector.