If you build a house by having it done by a professional, you're going to be paying more to have it completed. There's usually contract clauses and insurance to ensure that you're not left with a half-finished house.

When you hire that professional, you're not only paying for his experience, but all those other things, as well. There's a premium attached to those clauses and insurance. You could choose to forgo those assurances, and save some money, but you have a higher risk. Not to mention, a lot of better professionals would refuse, thus limiting the pool of candidates.

The author of the article wants it all: the assurance of the higher-cost option without the premium.