One thing about sales people is you have to be able to sell yourself before you can consider yourself as a good salesperson. Products and services are indeed your focal point in getting hired but if as a person you cannot sell yourself, then how do you expect yourself to succeed?
Such is important in businesses. You need to have a strong personality to be successful. For most it may not necessarily follow. But in this age, people are conservative and want to see results. It all starts on how you can convince them to hire you.