That kind of thing has been speculated on repeatedly. Nobody's really built a system to do it that's ever caught on, but there seem to be an increasing number o

That kind of thing has been speculated on repeatedly. Nobody's really built a system to do it that's ever caught on, but there seem to be an increasing number of attempts as the online advertising model continues to collapse. I think we'll see a mainstream effort at some point, and at the moment with rumours of an ad blocker being built into Chrome I think it may well come from Google. They already had a sort of prototype microtransaction system, it's not at all inconceivable that they could expand that programme. And with their own ad network already running, they might be able to make the transition very easy for people who're running Google ads - they are theoretically in the position that they could say okay, anybody visiting a Google Ads site using Chrome has the choice to see the adverts or pay a small fee, the browser will handle it smoothly for them and the payment will go through the existing AdSense arrangements with the site owner.