Its a shame that you think that. I achieved this easily, the traffic comes from a new technique. Its not Social or Organic. Its more like direct traffic.
I'm also making 90% from Direct traffic could i ask you what your approximate Clicks and CPC is? My daily CPC is around 0.20€ with around 200 Clicks but i have also a lot of multiple clicks for Tier 3 countries. I have also the feeling that AdSense pays a lot less for Direct traffic than for Organic traffic.
Really a good earning! I think you have optimized some high searches and high paying keywords and you are getting traffic from Google search engine.