Try to think of where the world would be without ads. Many sites that people frequently use wouldn't exist. There wouldn't be image hosts like imgur, for example. Many online comics wouldn't exist. Places like Hulu and CrunchyRoll wouldn't be able to allow people to watch shows online for free. TV across the world would be entirely different because everything would have to be paid for. The world revolves around money, and ads are a way of giving people free content. Sure, you can make the argument that "well I'm just one person." But that's a flawed mentality. What if everyone believed that? Then no one would get that content.
You seem to act like these are only people with hobbies of putting things on the internet trying to make some bucks off to the side. For lots of these people, it's their jobs. Its their lives. Some of these things are actual companies trying to provide people amazing content for free. And for what? Just seeing some repetitive 15 second ads? What you're doing is no different from pirating, except it's worse in that it's impacting smaller people at a lot larger of a ratio than big corporations.

