These can affect if you start network campaign. But I think if anyone manually choose website for advertising and check it's stats and then start advertising, he will get good results.
Exactly, but people barely start campaigns specifically site based, I think only 5% of my earnings on coinmedia come from direct campaigns.
This means that legit publisher are really getting hurt aswell by these people with their fake traffic.
They are literally sucking up all the ads, which leaves an unmonetized site behind for real publishers. In the last 24 hours I've only received 11 satoshis per hour, because there are no network campaigns left.