I have three browsers two have ad block one does not and that gets little use. I use the non adblock for flash as flash can kill my linux desktop with a restart at a certain resolution.
So i get adverts in this use case, most of the adverts where repeated, and one was an infomercial for a water heater which ran to twenty minutes was relatively local to my location and it played about fifteen times in the hour of the flash thing. The next day i looked at the band width used was incredible and decided that if I was the firm who bought the slots knew that i had seen it fifteen times then would be downright pissed off at the ad serving company.
Sure there ad got seen fifteen times by one set of eyeballs who was a 'local' but i dont have an immersion heater. Actually i found the ins and out of bad installations of these products interesting but i soon returned to my adblock browser. If isps insist on quotas for end users then ad block makes a lot a sense.