Sometimes it's a tough sell. I work for a consulting company that I think would rate as very high quality. We try to bake it into contracts and sales pitches that we work a bit slower because we don't cut corners. This isn't always appreciated by a client who's rushing to market. If you think about the old project management triangle, it's scope, budget quality and you can only have 2 out of 3. If you have a contract with fixed scope and budget, it's quality that goes. Getting a client to sign a contract with flexible scope is not easy unless you have a ton of credibility.