I am interested in opinions about blocking major websites, with good landing page scores. My website is in a niche with a one major advertiser - a well known US company. I have blocked it recently and my CPC increased, although I am not sure yet if the events are related. The reason I blocked is that because of the excellent landing page score of that company, they get a high ad position in my website without bidding high CPC. So the question is, do publishers benefit from advertisers with excellent landing page scores or not?
Where do you want to block? I can't understand what you mean... If you don't want these companies to appear in adsense ads in your site just use competitive filter option...