I tried the google ads on my website and after about two weeks I made over $100, but then google banned my account and took back the entire balance. When they ban you, it is for life and they don't have to explain why.
Because youtube is owned by google, I can't get any revenue from the ads, but they still run the ads on the video and keep all the revenue.
I have seen on several forums that if you make too much they will ban you, because they think you are clicking or telling people to click on your ads.