Imagine you had to pay every time you wanted to watch a YouTube video? Like when you goto a movie, or order cable TV, I'll gladly wait 10sec & click skip, vs shelling out money every time.
People seem to forget, the internet RUNS on advertising money. It's what pay's the "real" bills for servers, staff & redbull's.
IMO, if ads stopped across all internet sites, or the online advertising industry completely collapsed. The internet as we know it, would be gone.