I suggest that the cost to provide the service is either exactly the same thanks to amortization of equipment or only marginally higher for a small business wit

I suggest that the cost to provide the service is either exactly the same thanks to amortization of equipment or only marginally higher for a small business with a single line. Everything else is just the way they create price discrimination and exploit the customers' perception of value, much the same way that Microsoft have sixty-three jillion versions of Windows.