CMidd - 12:57 pm on Oct 29, 2011 (gmt 0)
The is a Glass ceiling to certain niches. There is a finite number of related advertisers for your site and their budget are usually set by day "and maybe not spread out evenly". What IncrediBill said is true, once their daily budgets run out, cheaper advertisers fill there place.
Ways to help:
Try to drive as much traffic to your site in the beginning of the day to capture more of those higher clicks.
Leverage an ad server, set it to replace adsense once you reached your normal high paying ad % limit or schedule it for late at night and on weekend. That way you can put affiliate offers up instead or the unrelated cheap ads.
Take some time to review who is advertising on your site. find the most common advertisers who fit your niche, see if they have an affiliate program "usually do" sign up, and serve their affiliate ad instead "even borrow their adsense copy/creatives, which is usually the same as their affiliate copy/creatives". << this has helped me a whole lot.
some sites, niches have a glass ceiling, which is set by the advertisers' budgets. wouldn't matter if you sent 1 million visitors in a day if your related advertisers combined budgets is $1,000 a day, you will only get $1,000 a day, then it's all non related cheap clicks from there.
But affiliate offers are usually limitless depending on the product or service, but it's a little more risk then PPC. But if advertiser are risking advertising on your site, there is usually an Return on investment "or they would have blocked your site".
Break that glass ceiling with affiliate offers.