“Design is expensive.” (AKA: “Design isn’t my priority right now.”)
Design is the first impression your clients receive. It’s something that represents the core of your business. If you feel that is something that doesn’t warrant consideration, and you’re happy with what you’ve got, then good on you. If you’re looking to impress your leads with professional and consistent visuals, then you may want to consider hiring a professional.
Compare your brand to your competitors and pretend you’re a first-time client: would you hire yourself? Without a good first impression, you have to work that much harder to grow the same client-base. Having a design to match the quality of your product is an investment.