If I have an automatic money making machine that keeps making me tons of money 24 hours a day even while I sleep, why in the world would I sell to anybody for couple hundred dollars? why would I want hundreds or thousands of people doing the same trades I do, assuming that my EA is really making money?
Yes, I agree with you. But I also know the fishing-net can catch fish, so why the fishing-net producer not keep all fishing-net for him self but he sold for fisherman ?