Websites in general don't earn much money from advertising anyways (from at least some users). The model of how online websites are profitable relies upon the majority of internet users either being ignorant of or not tech savvy enough to utilize ad-blockers and so on to avoid all of the advertising a website wants to show them or to get rid of all the page elements that are a bandwidth burden.
It might arguably be a better idea to have ISPs pay websites for their content and pass the fees onto the customers of internet service. The more visitors a webpage gets in a day, the more they can be paid. The less traffic, the less they get paid- but also perhaps the lower their costs will be.
The way I see it, online ads are going obsolete. Nobody really want to view ads anymore for any reason, unless perhaps if they're shopping. At least not myself.
And there are an abundance of plug-ins and etc. that will give you an ad-free web browsing experience, which means websites get less or no money from someone viewing their page in that fashion. The internet is just not like televison, despite how lots of corporate people wish they could try making online spaces more like that.
