I would say 99 % of traders who use indicators to form their trading decisions lose.
I would say 99 % of traders who have used Demo accounts to fully back -tested a strategy they have developed over a 12 month period belong in the 5% of traders who are indeed profitable.
This is why Brokers push the fact they have 56 indicators on their platform then once a new demo account is opened, they spam you with emails to open up a REAL Live account.
