They usually don't want that because it hurts their capacity to meet service requests to the backbone from people calling in on their communication line. They only expect the person that purchases it will ever really see it. If you market it and it becomes successful, they may be forced to remove it to stop the overload it may cause to their overall system. Thus, a vanity site is usually a risky proposition for a business. All the work put into the site can become lost if the doors to the site are closed.
People just assume the worst.
That you went out of business or were unprofitable and closed one of your business locations. Either way, it is bad news for a business. We offer 5Mb space with our dial in too. We just don't consider it business space. It doesn't have the required services.