At one time AdSense was very good as part of an affiliate marketing mix. However, AdSense is directly dependent upon the amount of human traffic to a site and the percentage that look at the ads. The percentage of clickers appears to be diminishing. People become oblivious to advertising over time.
Originally Posted by SAP Online
If you have good sites that get lots of traffic, you can probably earn more money through AdSense than with any of the similar systems. Keep in mind that Google will shut down your account and confiscate your earnings if you do not follow their rules.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -- Benjamin Franklin