I've read alot about scrubs and lowballers, no need to get upset. When the customer informs you of his shockingly low estimate; first ask to see this estimate to verify it. Next tell them you'll gladly match it as long as they have workers comp., a chemical license and a license with the town (assuming your town like mine requires these things). Next, inform them without these things, that company is running an illegal operation. When the customer asks the company for these numbers, it will give everyone a lot to think about.