because consumption and service connectivity aren’t the same? Consumption and connectivity are two different line items on the bill representing different costs associated with the service.

That’s fine. There are certainly some per-user costs. Such as the cost of billing each user every month. A fixed administrative charge makes sense to cover those billing costs. That cost is the same whether they are sending a $10 bill or a $50,000 bill, so a flat rate charge is reasonable.

“Infrastructure maintenance” is not a per-user cost. Maintenance is performed on the shared resources: the lines between the poles. The customer pays their own electrician to install, connect, and maintain a service feed; that is not part of the maintenance that the power company performs.

A transformer does not care whether it is maxed out serving 20 users, or it is maxed out serving just 2. It costs the same to maintain either way. Call it $1000 per transformer, just to illustrate.

In a neighborhood with 20 low-use customers (equivalent to 1 transformer) and 10 high-use customers (equivalent to 5 transformers), it is ludicrous that every one of these 30 households should be paying the same $200 “maintenance fee”. The 20 low-use customers incur an average of $50; the 10 high-use customers average $500.