Does this website take into account the current value of bitcoin as it stands on let's say coinmarketcap?  I would think there should be a updating value to pull data from coinmarketcap to help estimate the value of the account in BTC.  Realistically, these accounts should be valued in terms of EUR/USD/other fiat to keep the price of the accounts less volatile. Over time, the value of the accounts should grow linearly and more stable due to activity, post quality, etc.