If I had a million dollar, paying $500 to $1000 fee a month, expecting 10% DD but 1 million profit a year without doing anything
Theoretically this is how it should be done. Practically there are (at least) 2 problems with it:
1. It is very hard if not impossible to find 5 systems like you listed. And if you only use 2-3, you are exposed way too much.
2. Most of these type of systems die or suffer big DD just around the 6-7 months time frame. I never seen one making it to the year mark without a horrible DD.
Also you want to see at least 3-4 months returns before you jump on the band wagon, so by the time you do it the system is 2/3rd passed its useful lifetime.