Cost of the traffic is: hardware (staggered cost covered over many months), and running costs (subscription to higher tier internet carriers, electricity, rent

Cost of the traffic is: hardware (staggered cost covered over many months), and running costs (subscription to higher tier internet carriers, electricity, rent of the premises, salaries etc). Most of this is covered by the monthly fees, to have a profitable business one must have those costs covered as a minimum. None of the above affects how much internet data goes through, zero or maxed out capacity, cost is the same.