Some of them actually have long hair. Alas, the answer to the last question is quite a bit. The ad agency people, unwilling to turn down money, set out to build a Web page. And, quite often, they give the job of doing that to people who are graphic artists. Now I have nothing against graphic artists.
Graphic artists are necessary to get business messages across.
And good, effective artwork that meets a business objective is rare and the people who produce it are rare talents, worth their weight in a variety of precious stones. In those media it's important to have a powerful graphic that will stop the reader or the viewer and get him or her to pay attention. There are two reasons why that doesn't work on the Web. The first is that on the Web you don't use graphics to stop people as they go by. Most folks who show up at your Web site show up there because they are looking for you, or because they are looking for a solution to a problem or for an opportunity to seize.