The value displayed is based upon the market cap of Steem and the estimated amount of Steem that will be awarded to the account in the form of Steem Power and Steem Dollars.

http://coinmarketcap.com/

Steem is currently trading at around $0.28 per STEEM on relatively low volume ($1800). So whether or not you can realize the value depends upon the future success of the platform and liquidity.

Half of your rewards are paid in Steem Dollars which means the amount of STEEM you get over time will automatically adjust to be worth about $1.00.