A friend of mine is a web developer and has several legitimate web sites that he hosts himself.
He was complaining to me about how when he put in a filter to stop people with ad blockers his hits dropped by over 90%
I explained to him that the company he paid for advertisement was maliciously sending people to his site through
forced pop ups, spam, spyware. adware. and so on and then they were adding more ads and pop ups to his sites.
and I told him that I too run a ad blocker because of people like him hiring companys with "guaranteed hits". And I told him that I would not buy anything from a company that forced ads or popups onto my computer.
Within about 1 minute I saw his face turning red and he was 6 kinds of pissed off that I had never seen before. he got onto the phone and after all kinds of cussing and threats to said companys well.... now he only uses google ad words and honest advertising.