[themacguffinman]

...the content provider is only happy that the ad is shown because advertisers pay them for it. Advertisers aren't going to pay content providers if people loaded ads without seeing them.

[Hnrobert42]

How would they know?

[themacguffinman]

Because the browser would tell them.

And if this became a trend, it'd be really obvious in their ROI and they would stop funding the content provider.