Great post (and statistics) from ArthurNYC. I feel unless you get a ton of traffic Adsense isn't going to give you a significant income. Sure an extra $500 a month or even year is definitely welcome but you can't live off of it.

Adsense was good income 3-4 years ago but not anymore. I also feel we'll see the same deterioration of SEO in the next few years.

Tom
Bizak.com