That is quite wrong as if the accounts are registerd in 2011 and 2013 potential activity should be much more than that. A user activity is updated every 14 days or every Tuesday after 14 days something like that. To give us a clear example you should give us the btcaccountprice estimator price and details. If its true that these accounts are registered in 2011 and 2013 then you are selling them for a really low price. But first we have to check the token from the estimator.