The problem is that much of the times ads are disruptive, annoying, and potentially harmful.  When your choices are to have a) a safer, less disruptive browsing experience, b) potentially have your entire screen taken over with alerts offering to clean out the viruses found on you computer, the smart consumer is going to take option A every time.<p>The advertising industry, and those that employ it, need to aggressively move against bad practices, or the consumers will continue to do it for them.