I'm in agreeance with Graham's sentiment.
One of the problems with this entire industry is that to become a sustainable business, you have to pay a serious amount of money just to be able to practice your business.
Company A pays its licensing fees so that it isn't pulled off a job by code enforcement, pays for continuing education to avoid common pifalls and also to keep itself knowledgable of new products and how to properly apply them, pays insurance in case its tools are stolen or an employee of theirs makes a mistake and damages a house severely, pays it's employees well because they want knowledgable and capable people, pays for advertising (web/business cards/flyers/booth at a home show, etc...) to keep leads coming in, pays to keep their vehicles and tools up to date and serviced, and THEN it pays taxes on the income it earns.
Company B cuts corners by hiring cheap or illegal labor, doesn't pay for insurance or licensing, remains ignorant of pitfalls and new products and eventually gets nailed for tax fraud. If a company is out of business, it can't warranty its work. Ironically, this is the kind of company where a warranty is most needed. Their materials are cheap, incorrecly applied, and if an accident does happen then the homeowner is completely screwed because you can't get money out of a broke fly-by-night contractor.
Company B can easily underbid Company A because Company A's markup is going to be much higher to account for the costs of doing business. Company A is a rare quality company with goals and plans for the future. Company B is usually just some guy who's worked construction and is living paycheck to paycheck trying to get from one day to the next.
You can use some of those points to help sell your business.
Here's the kicker though (slightly off-topic): I've met some great workers who are terrible businessmen. Sometimes Company B does all the work great and is just shooting themselves in the foot by undercharging to stay "competitive", but really, they're ruining the market for everyone. When a customer's first priority is price and we're over their budget, we usually walk away. If you're bidding jobs ethically at the prices you've predetermined to be necessary for your business goals, then selling the same product for less is taking a loss, no matter how you look at it. We've found that "nickel and dime" clients are nothing but a headache, trying to extract as much as possible out of a contract. I've even had payments withheld if we didn't "throw in" a few extras, because these clients are used to beating up contractors. They know that we'll usually throw in a few hours worth of work rather than go to the trouble of filing a lien.