You need it to be affordable
Your company doesn't have an IT budget that will allow you to spend an extraordinary amount of money on a website. Additionally, you want to make sure that you don't incur a large ongoing maintenance expense. Fortunately, Drupal makes it easy to satisfy both of those needs. Drupal drastically cuts the time necessary to build a fully functioning, sophisticated website. Furthermore, after I have trained you in using Drupal's tools, you will be able to do virtually all of your ongoing maintenance on your own; you don't need to be a programmer, or even know HTML.
So, whether you are a solopreneur or a small- to mid-size business, you can afford to build a website of which you can be proud.