I have websites which generates more than 100$ daily on Adsense with 1000-1500UV per day. Medium niches. Average CTR 4%, CPC 0.5$.
It depends on many factors, main of them - Country & Niche. 100$ per day can be obtained in USA Insurance Niche with 10-20UV daily, or Trash Niche in India with 100.000UV...
100,000 visitors to make 100 USD for average website 7000~8000 UNIQUE visitors to make 100 USD if you writing on high paying keywords That's what I learnt and found out.
There is a legendary guy known as Jim hudson he wrote the 6 digit adsense code and I personally reviewed all his sites. His sites are not really well optimized with adsense, he likes to put 2 skyscraper on left and right sidebar above the fold. After evaluation by myself, I found out that the reason that he earns 6 digit per month is that he owns 200,000 articles in his website, and still growing, 200,000 articles as you know, the more pages you have the better => more traffic. His adsense success is due to the 200,000 quantity of articles/
Depends on your niche, your CTR and CPC. It against Google's TOS to share how much revenue you make, however, one my sites makes $$$.$$ in a little over 100 unique visitors. So to answer your question it depends on your website, optimization of your Adsense account, finding the right space on your website/s to maximize your CTR. Always use text and image ads together to improve your CPC. The more ads competing for ad space drives up the CPC. You may want to block certain types of advertising based on CTR in your Adsense account. Or block junk ads in the ad review center that are unappealing or you suspect low CPC. You can experiment and tweak everything until you get the settings just right.
There is still some wso teaching to ear $5k per month with little effort.I suggest to get an high cpc keyword and build site and get traffic to that site.
Another thing to consider is how many outgoing links you have on your webpages. Sometimes other links can be a distraction and heavily effect Click Through Rate. For example I had a tag cloud on a few of my blogs. I removed them and seen a 25% increase in revenue. Eliminate as many links, banners, that are low paying. Adsense will most likely make up for it, if you are getting traffic.
I would keep outbound links to a minimum for link exchange only, and place them below the fold or where they will not compete with Adsense. There is really no right answer and every website is going to have to be approached with the layout of that website in mind. I don't believe in link building. I used to. Not anymore. Concentrate on content and that will be your SEO. Eliminate numbers in blog URL's in exchange for text and that's it. Have something interesting to say and people will link to you. I don't know how many of my sites are sitting in the top 3 positions for my main keyword with less than 40 organic links from other sites linking back to my websites. I did not ask for them to link to my website, but they did because they liked my content. And it takes time. Google is not going to index your website in the top 3 after a few months. Sometimes it takes years, so plug away and don't think about the money, and don't give up.