Can you make a living from adsense?

I see a lot of websites offering free service but they use adsense as a means of income. Is there enough money to be made going that route?

If I lived in a state like Iowa, or Kansas, or any state that has a much lower average income and cost of living I could quit my day job. I live here in the Bay Area though and you need to make around 80k + a year to live comfortably. So, Yes you could technically make a living off of adsense, but it depends on what you could live on comfortably. And Google makes some nice 4 figure numbers for some companies daily so I think that there is enough to go around.

4 figures daily ????