Re: Mbps per month is a strange unit
In the networking world we always talk about bits, not bytes.
It makes no sense to talk about ports because your theoretical 10G port will almost certainly be shared. You might have a 100M or a 1G VLAN on that port but not the whole thing. Depending on who you peer with or how you've arranged for traffic to be managed you might flex that connection up and down in size - sometimes even dynamically. You pay for capacity but no-one likes to pay for unused capacity and so a lot of effort goes into making the paid-for capacity as close to the actual usage as possible.
In a market where ISPs are selected by customers based purely on lowest cost, anticipating demand and adding bandwidth ahead of the demand curve is a route to bankruptcy.