That's because introversion vs extraversion is a rather poor way to judge a person's sales skills. I've met extraverts who couldn't sell water in a desert and

That's because introversion vs extraversion is a rather poor way to judge a person's sales skills. I've met extraverts who couldn't sell water in a desert and introverts who could sell ice to an Eskimo. Believe me, there are people out there who just aren't good at sales. Sure they can learn, but chances are their time is better spent learning to code and figuring out how to recognize a good salesperson to partner with.