Most of the time, only your world matters. Mine doesn’t.
Until my world can help your world improve. Then suddenly, my world matters to you—because it has something that yours needs when it's needed.
In the grand scheme of our self-absorbed little lives, this overlap of mutually beneficial worlds is rare.
Understanding this, one would choose their entry into another’s world carefully.
(If you’re in charge of marketing or selling a thing, read that again.)