Knowledgeable athletes anticipate this problem by drinking plenty of fluids before and during exercise, even if they are not thirsty. A law practice works the same way. The point when the cash has stopped coming in the door is much too late to start wondering if you may have a problem. The seeds of the problem were undoubtedly sown weeks, months, or even years earlier. Lawyers don't have the time or the desire to learn business skills.
Planning is complex and boring.
There just isn't enough time to spend on non-legal matters these days. Let me counter these misconceptions. First, 'business' is not dishonorable at all. Doctors do it, architects do it, and every successful person does it. Anyone who doesn't understand that the practice of law is a business is living in the past.