This is sick. I'm getting between 90-140 uniques a day and I can't break a dollar a day. Ad placement can play a very important roll. Maybe you need to look at this. Also if your keywords are low paying this will also have an effect. I have another site http://www.buisness-trader.com.au which earns me around $150 in adsense per month and this site get around 200 visitors per day. Pay particular attention to my adsense placement. I hope this helps!