There is a large percentage of decision makers who want to be able to update their own sites, despite barely being confident enough to use Microsoft Word. In actual practice, the odds that these decision makers will ever actually update their site is nearly 0%. However, despite this, they still want the capability. If I were to show them static HTML/CSS, I'd starve.
For me, Wordpress gives me an interface that I can show these people before they decide to hire a quack who uses Wordpress for everything.
I've sometimes thought of a business model where I'd do content updates within 24 hours, but that just seems insane.