Whatever your place in the above maturity model, it’s all about your comfort. How much of your hard-earned profit are you willing to not take home as a draw? How much do you want to reinvest in the business? There’s a chance you never want to take a risk on spending any money on advertising and are happy as a one-, two-, or three-person company. And that’s wonderful. But if you choose to grow beyond that, it’s time to look at buying some advertising.