As mentioned above, sales managers often make less money than sales reps and perform a drastically different job. Tease out the candidate's motivations behind seeking this promotion. Do they want to be a manager because they crave a larger role within the company as a whole, and a chance to influence strategic decisions? Or have they gotten bored with their jobs, and management seems like a step up? The latter motivation is a recipe for dissatisfaction and a disengaged sales manager.