little more than 1000$ with 1 site,and opened about 1 year ago...All you need to do is : dont give visitors what they are looking for at your page,just give hints so they will look for a place to click (fx ads) it is time for 2nd website now so i'm working on it now...
Or you can give them EXACTLY what they are looking for and you will get more organic backlinks, and traffic. Although your idea seems quite good for CTR purposes.
My girlfriends make $1 to $3/ day blogging about high heels after a month so it is very very very easy to make at least $30 a month with adsense. If you are willing to work hard, learn about law, finance or internet marketing and blog about it then you could generate thousands per month on adsense, FOR SURE! But guess what? Nobody wants to work hard...
I won't say what i earn per day, but it's from 7 main sites although i have Adsense running on about 40 sites. I will say though, once you start earning over $100 per day it gets a lot easier to earn because you can just rinse and repeat by doing another site in a similar niche and repeat the steps. For instance, a site i started 3 weeks ago is doing $100 days now from 70c on it's first day because you get to know the easiest way to go about things. Just keep at it.