Trade pays off even if you're better at everything.
David Ricardo showed in 1817: even if Portugal makes both wine and cloth more cheaply than England, both gain if each produces what it's relatively best at and trades. What matters isn't who is absolutely better, but who gives up less. Same for you: delegate what others can do relatively more cheaply, even if you could do it better.
Useful: A boss who types her own letters instead of leading gives away her comparative advantage.
Source: de.wikipedia.org