I feel earning 3 to 4 dollors is sufficient. But how to increase this is the real problem. I would like to suggest you to offer some help to your visitors. For that you have to work a little bit hard. You have to give suggestions, counselling services, mediator services like that.
This is the only shiny piece of practical advice within the messy entanglement of opinionated confusion permeating this thread. Use it!
Try to increase english countries traffic to your website , your earning will increase upto 300% once your site get sufficient traffic from tier 1 countries , also try to put unique quality content to your website to increase click rate .
You can increase your earning by ad placement. Put your ads on likely place of your website where you think your visitors will click on it
How can we know this? Is it possible to access the likely places of clicking. I feel the banners are more suitable.
add unique contents. promote your blog, increase its value in search engine and use quality not quantity
depends more on the niche, I have a site which has only 100 - 150 uniques per day and earns around £50 per day
When I was first time making money online with adsense, I just always made great quality content. And I updated regurarly every day. And now I my earning increasing day by day. I think thats the basic.
All I have to say after doubling my earnings in the past month is: 1. Traffic 2. Ad Placement 3. Keyword density smartly played though! Thats all it is to it!