Some of the ways the data is collected on this site
Google Analytics show me the site visits and user demographics, which could help me improve this site and better target audience with AdWords.
The Ad Server ROI tags tracks page visits and actions on site. Combined with cookie data, it could also be used to help with targeting. For example, if you only visited the home page, I could show you an ad that take you to a different landing page.
While I look at the data from time to time, currently I am not using the data I collect. it's purely for demostration purpose.