Really depends on the ads thats on your site and what topic you are on. I would look at how many ads you are displaying, having three ad blocks lowers the chance of someone clicking on a higher paid ad.
Make a website(s) about something with better paying keywords or insert higher paying keywords into your current site (which match your site's content of course)
my keywords are first of all "qi test" - "quiz" - "survey" - "sudoku" - "personality test", I forgot to say that my site is in italian language ...
You probably should not expect very high paying clicks with keywords like those. In your case, you'll have to overcome your low paying clicks by simplying bringing in more traffic. Or perhaps you could find an alternative advertising stream, such as Adbrite or something like that where you may get more for your clickthroughs.
in my personal experience I tryed to change the target of the advisor to rise the pay per clik well I finally had an increase in pay per clik but with 1/4 of total clik... so I decided to come back. Unfortunaltly ma keywords are poor...