Essentially websites such as YouTube remain free because, in exchange for allowing you to watch videos, you spend a small amount of your time watching adverts.
If you use AdBlocker then essentially you are using the service without paying for it (paying with your time). You are stealing.
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Why do we need to have this discussion 5 times a month? I use ads on sites where I specifically want the creators to get money. If it's something like MSPA, Cracked, or TGWTG, then I disable the ads because websites like that produce free content and would have a difficult time if they didn't collect ad revenue. I also disable it if I'm watching specific Youtubers that I follow (mostly LPers that don't have manby other means of income.) If I like a website enough to frequently return to it, I make sure that the website gets its money. I probably wouldn't use Adblock at all if internet ads weren't so -blam!-ing terrible. A billboard for Picadilly or Nike on a highway is fine, but constantly having to look at "ROMAN ORGY ROMAN ORGY ILLEGAL IN 17 COUNTRIES LOOT THE BOOTY" might actually somehow trigger some kind of odd feeling of mild disgust and annoyance after a while. That's not even bringing up how often grandma's computer starts acting up a few days after she clicks the big "DOWNLOAD NOW" button at the top of the webpage.