[expatpat]

They need to charge for converted visits to the website.

[reagandemo]

"They need to charge for converted visits to the website."

Ok as a publisher you are required to do not only the advertising but the sales and support for them also. I don't think so. What works and works well is to charge a set price for impressions. That is how many people look at the ad. Your client does not get charged for false responses and they will re-book based on the cost per acquisition that they come up with.