For Publishers, unless you have MASSIVE amounts of traffic, PPC revenue will be extremely low. If you are an advertiser, it provides great targeted traffic. However, the website you send them to better be professional in appearance, otherwise the traffic will not convert.
adsense is basically only for publishers, its all about placing the adsense code snippet that you receive after your website is approved and that would generate income if clicked on by your website visitor.. money is directly propotional to your traffic . cheers Josh