AdSenseGuru4711 - 2:25 am on May 28, 2012 (gmt 0)
The only sustainable way to allow less targeted and higher paying ads to your site is to enable Image ads (text & image) instead of text only. Do not change the content of your site.
What you also can do is , sign up for other adnetworks and use DFP to let them run against each other so you will have a higher RPM for sure, but then again you have to deal with higher adminstration. I would suggest DFP but only if you earn around 100usd /day, before that it is not worth your time.