Well, it's a space with a lot of competition and the top paying ads go to the sites with millions of pages views. Ads are paid by CPM (cost per thousands) and the best paying ads are 10$ to 20$ CPM. So if you have 3 page views by Uniates, you can expect to make 600$ per month at most. In reality it would probably be a fraction of this. The ad market, especially in the US is trending towards lower CPMs even if the overall industry is investing more money.
Some models where you have a very targetted niche involve sponsoring content, reviews, videos, contests or events. But usually, you need a niche advertisers can't easily reach to make good money.
In general, don't expect to make a living unless you invest a lot of time in deals and grow your page views.