Actually, the value depends on the traders approach. Many traders have been using the demo for a long time, but till now struggling; because they don’t know how to use this practice account at all.
Better trade execution helps traders smoothly derive profit from the market. There is no trader who doesn’t get any loss in trading. But you have to try to lower your trading loss and higher trading profit so you can earn profit on average.
You will succeed one day provided that you keep learning at your top priority. There are several websites that provide traders with e-books and video tutorials for learning.