During an early season episode of Mad Men, John Slattery’s character, Roger Sterling, offered up this pearl of wisdom about business: “I don’t know if anybody’s ever told you that half the time this business comes down to “I don’t like that guy.” The same can be said about ad sales, or any sales for that matter. This is a competitive space and in many instance there aren’t huge differences in the actual product or service that will be delivered. What differentiates a company or a salesperson and is often the deciding factor is likability. Top performing, and typically likable, salespeople understand …