Your revenue per click will depend on the industry you choose. If you choose the industry with a lot of competition, then your revenue per click will go up too
You get better then what I get, most of the time, I get only $0.03 per click. I suggest you concentrate on getting more traffic.
Use google channels to the maximum. also google analytics is also beta trialing a new method of tracking exactly where your google adsense clicks come from. When this comes out it will be easier to focus on the higher paying areas and maintain those which are a bit lower paying. Once you find a higher paying sub niche target that as 0.06 per click may not be highest you can average.