Lol, you crazy man.
YouTube doesn't need to moderate every video, and I never said they would do that. But they can surely afford to manually moderate every video with 300k+ views in a day. Doesn't take that much resources, and YouTube has more than enough people/money to afford it. If a terrible video gets to the front page and gets suggested to users, it ruins their YouTube experience, and costs YouTube money. Do you really think YouTube doesn't have any real people working for them? One employee making $6.00/hour can moderate hundreds of videos daily. I think YouTube can spare it.
Have you ever seen the backend of YouTube which the moderators and developers have access to? Ever seen their algorithms? Do you know their parameters for what is considered a good or bad video (profit wise)? They CAN just look at a channel, and easily be able to tell if the views are legitimate or not. They don't have to PROVE it 100% in a court of law, just to their own satisfaction according to their set guidelines.
It is unethical to buy views. Just because everyone else does it, doesn't make it ethical. It is unethical, because you are contributing to making it even harder for people to "get somewhere" on youtube. Everyone should have as even playing field as possible. This isn't a lesson in ethics though, because this is a blackhat forum. But if you think cheating is ethical just because all the top guys are doing it, then I don't think we need to discuss anything further between us.