Since I've been out to the bid, and have planned the operation, I know what to expect on the day of service, whereas it might not be so well laid out if there is a separate salesman. This can help some people favor me, in that they already know I'm not a crack-head, and have a good understanding of what is important to them, aside from the work itself ( a commitment to safety, make sure not to scrap the new paint job at the gate, an important plant, etc).
Seems like something you can sell as part of your value, Chris, if I understand it correctly that you don't have a separate salesman.