Many people can never become good salespeople. It isn't because they can't communicate, they don't work hard enough or because they don't have any expertise in the field. It is because the sales profession innately comes with rejections, mistakes and failures, and without them a sales rep can never achieve success. Many people can't accept this because they can't take the constant little failures and rejections. In order for your business team to be successful and effective, it must have the right attitude towards failure. You, as the leader, must teach them that.