We at Technically Philly have had many short stops with sales help, making it one of our most prominent failures. Like many startups, we found that the three of us did the best sales, particularly when we were getting started.
I came across one of the better summations of why and what one could learn from working with sales people in a startup environment:
I boil it down to this: sales people are sales people. They are the lifeblood of many companies yet they are different than the traditional technology startup DNA so the ways that you hire, motivate, compensate and assess performance of these individuals will be different. Obviously to understand a “class” of people you have to make broad generalizations. Here are mine.