The time you spent honing your design skills will also pay for itself: as your skills and experience grow, you will find that you can produce good designs more and more quickly. Good design doesn’t really take much longer than quick-and-dirty design, once you know how.
This allows for scalability in productivity, and follows the law of diminishing return. The rule is not to work hard, but to work on your strategy as much as possible so then every hour of your time is worth more.