I have just got a list from a Adsense pro who suggested me to filter the low CPC Ads from my adsense blocking tools. I have just applied it to my account. I found this may be useful to you and pleasure to get the replies from you . If you have any doubt reply on this thread or pm me. CHeers
I think when you block these Ad-networks, the Ads will no longer appear from these networks, hopefully as she is saying (the low CPC) ads will go away ! I will give it a try and come back to share ! By the way : did you do it ?