I set up Site Targeting Ads on Google Adwords and a few weeks later I've noticed that some of the sites that supposed to display my ads are not displaying any ads at all (not only mine but any, none) or are not displaying my ads while I have many showings of my ads reported on those sites and my account was charged. One of them is 2CHECKOUT.COM. Therefore I stopped ALL my site-targeting campaigns on Google. Here's an email I received from Google:

Hello ( ... ),

Thank you for your email. After consulting your issue with our technical team, we have determined that there was a temporary error in our site targeting program. Since www.2checkout.com does not display ads from Google, please delete this website from your site-targeted list in order to avoid any further charges while we work to resolve this issue. I
apologize for this error and for any inconvenience it may have caused.

Also, to thank you for your patience while we investigate your situation, I'd like to offer you a credit of US$1.00 toward your Google AdWords account.

If you'd like to accept this credit, reply to this message with your confirmation. After we process your credit, you'll see it reflected on your Billing Summary. To view the credit on your Billing Summary, please allow a couple of days and then follow these steps:

1. Log in to your account at https://adwords.google.com/.
2. Click the 'My Account' tab.
3. Review the 'Billing Summary' page. The credited amount appears as an
adjustment for the current month.

If you encounter any similar situations in the future, please let us know.

If you have additional questions, please visit our Help Center at https://adwords.google.com/support to find answers to many frequently asked questions. Or, try our Learning Center at http://www.google.com/adwords/learningcenter/ for self-paced lessons that cover the scope of AdWords.

Thank you for your understanding. We look forward to providing you with the most effective advertising available.

Jason D.
The Google AdWords Team

This is very interesting. How much money did you lose, if they offer you only $1.00? I think you should ask them for much bigger compensation!

I have also tried to use Site Targeting recently, but didn't get any clicks at all and disabled it. Can anyone share if they had any success with Site Targeting option?

Thanks.

I "spent" about $10 for site targeting ads and Google refunded $1 for the evil 2Checkout.com. As for the remaining $9 - Google wrote that they provided me with site targeted ads and they probably did, but there were at least 2-3 sites that were not displaying any ads at all and I question this system, I think it could be a click fraud, but not by visitors or webmasters, but by those sites who provide space for your ads. And Google seems to approve such sites such as 2checkout.com without even checking whether they display ads or not!!