did block some of them: my competitors, mfa's, ringtones, etc etc. the only purpose was to take care of my visitors, don't want them seeing those adds...
take a look at them, make some tests in here perhaps: https://adwords.google.com/select/KeywordToolExternal and see what you find out!
For me blocking MFA brings down click through down by about 50% and revenue comes down by about 35-40% so I have not blocked anything now.
Thanks for your valuable infos. Yes, I just wanted to share those infos to you all. I realized from my adsense report that the low paying ads have better CTR. So google´s algorithm definitely delivers better ads to our sites.
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I think the only time blocking ads is beneficially when you want to block out your competitors from appearing. I did some experimenting with this by blocking some ads, and the results were not good. My CTR dropped significantly, and I was also receiving less per click.