No, I didn't mean that, maybe I wasn't clear enough or didn't know how to explain myself, let me explain what I meant with a little more detail.
What you are saying is true using AdSense will never get you ranked, but since Google likes to make money they will drive a few people to your site, it's not much around 300 visits/month. I tested this a little while ago with a brand new site, not SEO optimized and only 5 articles. Now I must also add that I used blogger in order to create the blog.
After the end of the 3rd month I made $2.47USD from AdSense, so.. yeah Google will send traffic to your site, how.. I have no idea but even if you get 350 visits/month thanks to AdSense then it's still 350visits/month. The only thing that AdSense do for you in your site is money and get you ''noticed'', making Google know that you're there, that you exist basically but it doesn't mean that it will have any effect on the SERPs.
Also I must point out that I tried it without AdSense and there was no traffic at all, 0 visits/month.
I hope this clarifies a little bit my previous comment and if you know why I was getting that traffic or where it came from it will be a lot of help.
Thank you in advance.
Regards,
John