Re : Bitfarm

Probably due to http://en.wikipedia.org/wiki/Zimbabwean_dollar
Despite attempts to control inflation by legislation and three separate redenominations in 2006, 2008 and 2009 respectively, the use of the dollar as an official currency was effectively abandoned on 12 April 2009 as a result of the Reserve Bank of Zimbabwe legalising the use of foreign currencies for transactions in January 2009.[4]
So all the sites probably use old rates...
 
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