Search Engine Optimizers (SEOs) concern themselves with monetization. Monetization can include AdSense, but usually the SEO is not too concerned with AdSense because AdSense pays so little. However, once the webmaster is dedicated to monetizing with AdSense, a whole genre of SEO kicks into gear. A Made For AdSense (MFA) site is a very unique beast, and can be quite profitable. Google even gives training classes for optimizing sites for AdSense. One of the popular MFA topics these days is free ringtones.