I'm a YouTuber and I would never recommend AdSense as a business model. The main reason is that it's too little of a revenue. Even if you're like PewDiePie, you're better off monetizing the number of subs and views on something that will bring in way more money.
I get around $2 per 10k views on YouTube on AdSense. Imagine how many views I would need to get to make a killing then.
If you want to make some real cash with YouTube, think about either creating your own product or affiliating for someone else. Either that or sell links, annotations to vendors in your niche.
For example, if I'm a product creator and I have a product on dog training, you could rent your links to me (on the premise that you're into dog training as well).
I am actually a product creator and I buy links from YouTubers as well.