The biggest mistake you can make when answering this question is to simply say, “Because I like it,” or worse, “Because the money is good.” This doesn't really tell the interviewer anything they couldn't have obviously guessed—and it certainly doesn't help to set you apart from other candidates.

Successfully answer this tough question by focusing on your sales history. Think back to when your passion first began. Was it because of a summer job? Or maybe it started as early as childhood. Briefly illustrate this passion with real-life examples and include a success story, if possible. Then tie it in to why you still want to work in sales. Employers will take note of this longstanding drive and remember your answer because of your personal story.