Youtube is a very critical concept for making a living. It totally depends on three things first is your niche, your content and your youtube marketer. We last year made near about 30K$ and this was a huge amount for us. We had 80 videos on our channel and we got a lot of traffic from the fifth month.
First, 6-7 months we did SEO and now we are making approx 200$ a day. But yes, out of these 200$ we are giving 20% to our marketer to do SEO.