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If a person has two choices on ads, they won't alway select google. So your CJ ads are stealing from you adsense ads.
Not that it's a bad thing. Diversification is always smart.
It may be a case of the left hand stealing from the right, but it's balancing your revenue which I would think is a good thing :)
One advantage of having multiple revenue sources is that one may go up while another is declining. For exmple, on my European leisure-travel site, advertising and affiliate revenues are cyclical. Low winter hotel bookings mean small affiliate checks in spring, while high summer bookings mean large affiliate checks in the fall. With advertising, the revenue cycle is different, because income is generated while people are planning their travel instead of when they're actually on trips. Who knows? Maybe you're just in an AdSense down cycle and a CJ up cycle, and maybe the opposite will be true a few months from now.
P.S. It doesn't tell us much that your revenue has gone down. Are you talking about clicks or earnings per click or both?
Byron... not sure what you mean?
But my impressions are right up there... growing in fact, at a nice rate.
But clicks and clickthroughs are way, way down.
I'm also noting that the general quality of the ads is not there.
What i mean is design your site so you can run a CJ ad in your header area and run a google ad as a sky scraper or bottom box or a "sponsored link" section. Your obviously not understanding the mix of ads that make sales on your site so design your site and program to achieve the revenue your looking for. Nothing wrong with multiple ads on your page if it looks good and fits comfortable.
As for adwords revenue dropping. You have to remember it isn't google paying you for the ads, it is the person who is buying the ads from adwords and paying you. Most programs last a few days/weeks at most and are changed, dropped, moved or cancelled. Your not ever going to maintain a steady rate of CTR or earnings since it is so tied into how much the person wants to spend on the other side.
What do you mean "general quality of the ads is not there" are you getting PSA's or not matching topics or what? Remember the ads are up to the people spending the cash on the other side. Christmas is over, this is a presidential year and spending hasn't really taken off.
With elections around the corner, taxes being due and the instability of the world markets advertising is a TOUGH market right now!
best of luck though! Adsense isn't a miracle revenue program. Just part of the toolkit a webmaster can use to build a succesfull site!
I installed phpadsnew, put a bunch of affiliate ads in there that match my google zones and setup my alternate ad in google to point to the phpadsnew invocation script.
voila no more psa's..
Your main index of articles will probably change all the time - however your articles themselves will probably be stagnent.
Work on SEO and getting your articles linked to increase your revenue. If articles are short lived (expire soon) it will be hard to generate revenue from adwords.