lol it's actually not that much, you gotta be partnered with Youtube or a network. I did it last year, it was a one year deal with RPM, the child of Maker Studios, major company bro, look them up. They partnered Pewdiepie and RaywilliamJohnson. So i did the one year deal, my earnings per 1000 views were fluctuating, i was earning between 3 - 10$ per 1000 views. Currently i am a free agent and have been since May 13, 2014 and i haven't posted shit since then. I earned some good cash, got myself around 5 k followers, and i feel good about it. Around 500 k views in total since i started in March 2013.
Here's a good tip. If you want to attract the majority followers, you have to be VERY childish and immature. Yes, like Pewdiepie, there's a reason he's the #1 guy on Youtube. Majority of his followers are like 9-12 years old, act like their age and you'll be getting money. However it's really embarrassing and i would never do it even if the money was good, which it is. The dude earns millions per vid. So yeah.