My view is, I can't be investigating every job. If they need a new service, they need a new service.
If I am out looking for work and I see really clean windows, I keep on truckin. But if they come to me, that job is mine.
I have a family and I work hard to make customers happy. I would never underbid to steal a customer from someone. But I will take a unsatisfied customer in a heartbeat.