Seeing as almost all real humans are running ad blockers now, I don't think many advertisers would pay for ads if the people selling them actually told them the truth. Online ad fraud has been a problem since 10 minutes after online ads were invented and the situation has been going rapidly downhill since 2005 which is about when the average user discovered ad blockers, because Firefox extensions just made it so easy. I'm even running one now, although I white-list sites I like, like this one. I'm even running an adblock detector blocker.
Fun fact, did you know that there is no actual proof that advertising really changes anyone's opinion on products. The only thing it's been proven to do is let people know a product exists, if they didn't already. So advertising well known products like Coke and Tide may actually be totally pointless.