1) what are the 8 sources? and what is the criteria you use to display the ads that drive people to your site. for example, for Google adwords do you use keywords? if so what are they?
2) Can you give us an idea of the kind of users you get per day? I just checked your Alexa stats and it confuses me as my own website is ranked higher but I don't make ANY money from my Google adsense :-)
Stop worrying about my users mate...just do what I did looked at your data, worry about your userbase. Not going to elaborate on how insanely inaccurate alexa is but the site is very new so you can't look at my ranking at all I have sites getting 100,000 visits a day with a Alexa ranking of 120,000k and a site that gets 10,000 visits with an ranking of 50k. It's usually somewhat accurate after a few months and the ranking is below 10,000 other than that I don't look at Alexa at all.
If you can answer those questions in 5 minutes then I'm confused as to why your not making money even with 100 visits a day if you can't then...that's why my friend.