Adsense websites, do not do that, they are getting paid by impressions - it doesn't matter if you click on the ad or not, the matter is the CTR.
Even if the user use the AdBlock the Banner Ads are still there,
I think you are mean for some websites who using Adsense with another ad monetization on their site, such as Pop/ Push notification/ Downloads ads.
At first, I was very confused about Adsend, if I can make any revenue with other ad companies if the ads will be shown by Ad-block. and this is really important to understand that!!
If your ads are not affecting directly on your Adsense it's OK to use is, even your CTR will stay the same.
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