Being a stock broker, you should be excited about sales! Talk to the hiring manager about the aspects you love most when it comes to sales. Sales people love the competition so be sure to discuss the wins and how that affects you.
"The thrill of the hunt is what I enjoy most about sales! I love to source a new potential clients and win them over. It's exhilarating. Also, being on the leaderboard in my firm is really fulfilling to me."