How are you going to support a fire department when they only get paid to fight a fire when it occurs?
A fire department is an insurance policy, rarely used, but there when you need it.
They need a consistent funding source.
No one will pay if they know that they will only get charged if a fire happens.
If the fire department cannot be sustained on a fee-for-service model where it can bring in sufficient revenues to offset its operating expenses, then they, as any other business, should compensate by reducing their operating expenses. I have no idea what you’re advocating for but I have to say it sounds completely incomprehensible.
Let me ask you this.
How are you going to support a doctor’s office when they only get paid to provide medical care when it’s needed?