You may not be unfamiliar with CPM. Whenever a unique user who does not own a post opens your post, it creates an impression. It seems weird that you want to buy your posts over and over again. But believe it or not, there's a good reason. The amount of each impression is evenly distributed between owner and publisher according to CPM on the spot.

But if you are both the owner and publisher of the post, you get the full amount. So if you believe that your post is of high value and quality, then you should own it in every way because it maximizes your benefits.