Online publishers should closely monitor the ads being shown on their website
It appears that some ad networks do not have any ads to show the website visitors. So though the website is having some page views, the online publisher revenues are zero, or close to zero.
The ad network is only showing their own ads and not paying the publisher at all, though the publisher is paying a large amount as domain renewal,webhosting fees
Paid to click Advertising is the only way some webmasters can find new websites, Google and bing are mainly giving junk results