Constantly

Do the ads that show up on web pages actually work? Most of them are the same thing over and over again, only they change the city name that you are in. There are others stating that a single mom has found the key to wealth or white teeth or even the best fat burner. I'm just wondering since people see these ads all the time on nearly every website they go to, do the people who put the ads out ever see any revenue from them? Anymore, those ads just seem to clutter up the sites that they are on.