Some robots produce profit but I have doubt that these help to make constant profit for a long period of time. Even though what do you mean by "a long period of time"? Is it one month, six month or one year?
It just seems that new bots are coming out all the time.It seems like the older bots are out dated. If I buy an older bot is it a waste of time, must I spend $$$$$$ gaining and losing by trail and error..
EA can replace human work needed to trade manually and can calculate very precisely
But it works only on given logic.
If the EA has a profitable trading strategy it can make more profit than manual trading as it can work 24 hours a day 7 days a week.