The old chestnut of 'if you build it they will come' is one of the guideline concepts that many gurus teach unsuspecting new Internet marketers - choosing to let them believe that as long as they've built the site that the rest will fall into place as easily as creating the site itself.
And that's a LIE!
It's a lie that you don't need to promote your site - but its something that's rarely covered or taught in most classes. You get all the tools you need to create a site, but you don't get the information that explains how to build a regular stream of traffic to your site.