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Recently I changed my mind and unblocked them from my sites. This had no impact on my non-adsense revenue, but my Adsense CPC (and therefore revenue) went up by over a third.
Apparently, from day one I had been blocking a real big spender ...
I just wish I could know what to tell my friends who have AdWords accounts so that they could be sure that their ads are running on my site... unfortunately AdWords advertisers don't have something like: url:.somedomain.com to guarantee it, but it would be very helpful...
It almost seems to me there might be a massive grassroots change happening due to adsense in how we think about competition on the net.
If I can't make the sale for 2 bucks, why not make 1 buck and let my competitor have a go. It might be better revenue then a lost sale altogether.
There are some markets where the opposite is true - if you keep the customer you make 1 buck, if they leave your site via an adwords click you make 2 ... or more.
Sure, it's a mixed thing to send your users to the competition (even if you don't make money by keeping them onsite), but in terms of AdSense performance.... it may be very significant.
It's been at least a month since I've said this, so I'll say it again: some surfers are oblivious to all visual cues (logos, URL bar, text, "about us", etc.) to whose site they are viewing. I'd be willing to bet that Brett gets e-mails that begin, "Dear Google: " :) Hence, it pays to monitor any advertisements being fed by a third party lest you run an ad that diminishes your site.
I definitely saw a drop in ad revenue when I blocked competitor ads. The keyword trigger for these ads was a fairly competitive (i.e., high priced) term. I'm sure when I blocked them Google had to feed ads with lower click prices. On this site, though, ad revenue is more of gravy item than the key revenue source, so I don't begrudge the lower numbers. Well, maybe a little... ;)
I unblocked all of them a few houres ago, and I find it strange to see that suddenly after two houres my earnings were much higher than normal :/
I'm going to see how this evolves over the next few days and I will report it in this thread.
No real difference for me either.
I think it was just coincidental or I was getting better ads put my way in the beginning.
Of course as rogerd said if they have to feed through lower paying ads due to the ads you have blocked then this would cause lower earnings, though unfortunatly this was not the case for me I must have just had a few good days in the beginning :-(
I can't say whether this is due to a steady decline in earnings per click across the board or if it just some kind of natural normalization... in any case my initial rise in earnings has not lasted and my monthly averages remain pretty constant.