Sure it is. Consider doing any/all of the following:
- Try higher paying keywords
- Optimize your ad placement
- Optimize ad integration, looks, size, etc
- Check the engagement of readers with your content.
I don't suggest making crappy pages but, if readers find
all they need within your content and ads are not very well
placed, they will have little incentive to click on them.
- Check your traffic sources. Are visitors targeted enough ?
- Check for other "distractions" within your site ( too crowded
with other offers, crappy design, etc )
- Make more sites/send more traffic
Depending on the choice of keywords, $30/$60/month might not be that bad.
In any case, I've personally chosen to go the CPA route ( they've
proven to be more profitable for me in most cases), but there are many people still making a lot of money with this.
Good luck