We have a lot of repeat traffic on one site and so our CTR is low because the same ads keep showing up (even though we change/add to the content often). I'd like to get some new ads to appear, so I am thinking of blocking the top few advertiser domains. I think the CTR will increase but am afraid the EPC will decrease, leaving us in the same situation as we are now revenue-wise. Does blocking work for anyone with repeat traffic?