How much CTR you have gotten when you got $2.67 for 23 clicks? Your clicks may have considered as fraud clicks.
Well, $0.1 per click sounds ok but for every click worth the same, there must be something wrong.. Have you try filtering your ads? If you haven't its worth to try Check out my sig 'increase adsense earning tonight' for ads filtering..
Try filtering ads. I sometimes got $0.01 from some ads, but my earning per click increases when I filter some ads out.
You should not be worrying about things like this. It is impossible to change how much your clicks are worth. If you want to increase your earnings, do more of the only thing you can do: increase traffic.
After I changed one of my square links to image, I got $.45 for 1 click! Wow, seems to be formatting problem...
It's better now... I lowered my ads to 3 from previously 3 spots so that only the higher bidders will appear..