A few reason a website will benefit your business needs.

Online retail grew in 2005
Internet spending for 2005 gained 22 percent over 2004 spending.  Data released by comScore Networks finds total Internet spending, including traveling, hit $143.2 billion in the year 2005.

Most people have PCs and Webs Access in there homes
Sixty-two million U.S. houselhold, or 55 percent of American homes, had a Web-connected computor in 2003, according to just released U.S. Census data. 

2005 Holiday shopping exceeds last years
Weekly shopping online retails rose from 348.3 million in 2004 to 462.5 million in 2005.  This is an increase of 33 %