But why is it better (for him, for anyone) for his success to come from one avenue than another? If he knows "companies I invest in tend to succeed," it's hard

But why is it better (for him, for anyone) for his success to come from one avenue than another? If he knows "companies I invest in tend to succeed," it's hard to see why he would skip over a great company, possibly allowing them to fail. It might even be considered unethical if that company produces something useful to the world.