i think its visitors who dont like to click your ads.... that is why i have 3 or 4 different ads network on my site so that if i dont get clicks then i will earn from impresson or shopping ads.... because it is very hard to say what kind of ads visitors like...
my post was the last so how am i suppose to know who your talking about if you dont put them on quotes?? next time have them on quotes so that i dont get confused...