4 cents / click is good, if you only earn 4 cents from 30 clicks , probably ur visitors are not from US or Euro. i got 10-20 clicks / day and making 1-2 dollars.
You should try to filter MFA sites. Adsense preview tool might help you with this. There is a link: https://www.google.com/adsense/support/bin/answer.py?answer=10005