Getting your money later means that your you are effectively giving out a free loan to whoever is holding your money. For you that's an opportunity cost because you can't reinvest the money for some period of time.

If your expenses have to be paid before you get your money this can also be a cash flow issue (or make a cash flow issue worse), when a peak in demand leaves you very profitable but unable to pay your bills because you're waiting for your money to arrive.