Actually, freebitco.in makes ~$1,800 USD worth of bitcoin every day! ...
How do you know that? Source?
I used
http://siteworthtraffic.com it gives approximate readings based on site traffic.
lol you know those tools are a gimmick right?
It's not that bad, it's rather approximate. For example, someone told me how much his site made and I checked it up on that site and the estimate was only $3 difference. Of course, that site only estimates for one ad, so if you use google adsense+more advertising providers the results will be much different. But yes, they can never be accurate.