Google releases pay-per-action beta for content network.
Larger retailers will be leery of sharing conversion data with Google. For retailers who aren't concerned about sharing data with Google and who are running content campaigns,this is a great solution to content spam.
Emphasis mine below:
Increase your advertising reach while paying only for actions that you define. First, you'll create an ad and define the action that you want a user to perform when they visit your site, such as signing up for your newsletter or purchasing a product. Then you'll set the amount that you're willing to pay when this action is completed. Finally, you'll install conversion tracking code on your website so that we can verify when an action has been completed.
Once you've completed these steps, publishers in the Google content network can choose to place your ads on their website. You'll only pay when a user clicks on your ad, visits your site, and completes your desired action.
This is a clear case of Google "getting it".