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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How about this instead: I'll keep AdBlock installed and I'll do what I would normally do if didn't have AdBlock and had to watch an ad. Ignore said ad, flip the bird at my screen, and masturbate furiously for the minute or two said ad would play. They play that ad because they want me to buy their shit. Thing is, I will never buy their shit. Hell, I don't even pay attention to it. For all intents and purposes, that ad didn't play because there is no difference between me sitting and watching an ad play and me sitting and staring at my computer screen blankly for a short period of time. But no. Mega-Conglomo-Corp gets all butt flustered because a computer program is actually telling them I'm giving them the double bird while jerking my crotch in their direction. They can -blam!- right the hell off. Even if they succeed in getting AdBlock banned and forcing everyone to watch their shitty ads know what I'll do instead? Mute my computer, open new tab, browse for about three minutes before going back to the video and resuming it from the beginning again.