Millions of users click on links daily,, at least ten percent of browsers click on PPC or CPA links on a daily basis.
A cost per action means that the referrer site only gets paid when an action is performed. An action can either mean an actual sale or a lead generated (such as an opt in form filled out).
It eliminates click fraud, as well as another more insidious feature of PPCs.
PPCs do benefit the search engines and web sites.
They put advertisers where the eyeballs are; advertisers get clicks, and pay for clicks. As an advertiser, the more clicks you get, the more you pay.
But search engines and publisher web sites do not care with PPC if you make a single sale (that is your business).
With pay per action, your health is their health, and you discourage automated websites that do nothing except serve as glorified doorways.
And no longer will Yahoo threaten small websites with small SEO budgets by way of their infamous "pay for inclusion/pay per click" packages. :!:
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