i dont what shall i do i work hard to get more clicks and after i got good number of clicks i got less income more than 1000 clicks with less than 40$:S what the hell of that:S same keywords make more than 40$ with less than 300 clicks b4:S
You are probably smartpriced. Try writing on a different topic or/and try using section targeting if you don't already do so.
4 cent per click is not at all encouraging income. but can you please tell us what was your ctr?? i think your ctr is very high. try to minimise it less than10.
It is all about quality and the subject of the content. Use an overture bid tool to see how much ppl are bidding on the keywords. If the bids are high, then Google is not considering your site to be of a good quality. Read the Google webmaster guidelines see what you need to change to comply with the requirements.