There is one very good reason why you should be tracking the performance of ads being placed on your pages: It will bring in the most ROI.

PLR articles are private label rights articles and are a very useful way to add search engine friendly content to your website. If you are building a large Google Adsense website to make some money, then you need many articles that are search engine optimized with keywords.

Although Google AdSense is generally considered the current leader in content-based, online advertising, it's important for web publishers to realize there are many alternatives to this program, whether they are used instead of or in addition to AdSense.