Stay in contact with suppliers and sales people. Stay in contact with customers. Make business easier to transact. It is easier to respond from your web site than by phone. Save printing costs.
Information is easily updatable and changeable on the Web.
So people who are state of the art know you're state of the art. To be among the first, to lead not follow . Efficiency - reach more people for less money. Save money in advertising and marketing. Find qualified employees.