Usages of demo trading accounts can be many. A trader can learn his fundamental aspects associated with trading bearing loss of his capital. Even a trader can develop his psychology by dealing with artificial money as like as any real invested fund. Even to deal with my emotions; I have tried to judge my trading decisions via use of demo account of mine to understand whether the decisions I have taken are right to provide me definitive income or not.
Though it is not possible to do so in every trade decision, at least for the big investment I usually try to recognize whether my trades will provide income or not as per my expectations. However, every trader can even judge the usefulness of his trading approach with the help of demo trading account.