The way it works here (the Netherlands) the monthly cost for the connection to the grid depends on the maximum current and number of phases.

Some examples: a 1 phase 1A connection costs €11,12 per month, 3x 25A costs €168,99 , 3x 80A is €408,94 (there are other capacities available with different rates).

To me this seems like a fair way of doing it, someone who draws more power (or higher peak power) needs a beefier hookup and that requires beefier and more expensive equipment and cables.