Your best salespeople possess vast knowledge about how to connect with and motivate people – and perhaps take the company to the next level. But they rarely get to share their knowledge with senior managers.
http://blogs.harvardbusiness.org/hbr/hbr-now/2009/07/leaders-listen-to-your-salespeople.html
Salespeople are optimistic by nature–make use of that optimism, and let some of it rub off on management. As you progress in your career, you will find that some of your toughest sales jobs will be internal rather than external.