It's not. It's a reminder that all of your sales and marketing efforts are wasted if you're not actually pushing towards a sale. Calls to action, follow ups, using funnels—all of these are things that increase an individual's likelihood to close. That's "ABC".
Yes, a three-letter acronym is incapable of expressing every nuance of a complex interpersonal dance. ABC is about sales and marketing driving towards the close. It doesn't mean you turn a cold call into "Hi, my name is James, buy my product. This is what it does. Buy it. Do you want to know more? Buy it first."
