Ha ha, that's the beauty of it: I don't know. I just know it works. I know it from a source[1] which I consider reliable. And that source presented empirical observations which strongly support my view.
You keep talking about how it would work, doing what's amounts to a thought experiment. That's valuable, but not nearly as good as actual observations in assessing how the world works.
From the dawn of humanity, the Sun has been observed to rise from a direction and set to a roughly opposite direction. Why? How? For a very long time, no one knew. But only a fool would contradict that observation just because what he thinks of the sun doesn't fit what everybody sees.
In short, when your view of the world doesn't fit the observations, update your view of the world.
Now, I see very few ways in which you could still disagree with me: (1) You think I misreported my source. (2) You don't trust my source. (3) You know of very strong evidence which support your view and not mine. So which it is?
[1]: Against Intellectual Monopoly