Hello i think your variant is very complicated. If you have the right moneymanagement with trading with an ea you can make very much more money in shorter time than you can ever do in manual trading.
The only thing is why the most guys gone bad with eas, that they dont understand the strategies or when they understand it, then they would make more profit and gone risky settings at the ea.
In manual trading its more simplier to trade thats right. A ea must have the right broker, the right account, the right account settings, enought money to work and so on.
I have the strategy to use different eas on different brokers, different accounts and with different money on it. Therefr i can tell you that i do not must do any other work since three years and can live fineley from the profit. The investment is not high.