"earn bitcoins" Data from https://adwords.google.com/o/KeywordTool
Broad:
Keyword - earn bitcoins
Competition - Low
Global Monthly Searches - 5,400
Approximate CPC (Search) $2.17
Exact :
Keyword - earn bitcoins
Competition - Low
Global Monthly Searches - 1,300
Approximate CPC (Search) $1.77
Broad:
Keyword - earn bitcoins
Competition - Low
Global Monthly Searches - 5,400
Approximate CPC (Search) $2.17
Exact :
Keyword - earn bitcoins
Competition - Low
Global Monthly Searches - 1,300
Approximate CPC (Search) $1.77
Your domain has the word earn and bitcoin in it, that doesnt mean it comes up on search for the term 'earn bitcoin' in fact 'earnbitcoin.org' doesnt even come up with your site...
Just because you've opened the keyword tool and entered a keyword doesnt mean that your site is related to that keyword... and I dont think anyone wants to pay $2.17 to get a click from a term your domain already contains
