If your business model includes charging your customers (designers) directly for a service that improves their ability to earn money, you can totally do it, if you just put enough elbow grease into it.

If you don't charge your primary audience, if you get into some whacky convoluted business model that doesn't involve charging them, you're almost surely going to fail. You reduce it from skill and effort (create value, charge directly) to depending largely on luck.