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If you think you can make your first million by doing nothing and letting your thousands work based on someone's strategy then it won't be too long to realize that you actually lost thousand instead of making millions.
Self trading itself is not easy and some who have failed in trading have found themselves to run those copy trading strategy and as you said it is not a cash bag with copy trading. Those who you want to copy are still under some losses as self trader but they learnt the copy trading technique to market to people that don't want to learn. If someone has a better trading technique, he is likely going to use it for himself and family, this is suppose to be a right thinking way for users of bot traders and copy followers