I am not deaf and fortunately nobody from my family is.
But I have a friend who is a electronic technician and he activates those implants, make some checks up after a month and make sure the fine running is adapted to your needs.
He is under paid, needs to travel a lot, working on Sundays when needed and some times his working hours are long and exhausting.
He still says he has the fucking best job of the world and he is not thinking in switching in a million years.
I guess they work good and they are quite rewarding if just the technicians are this devote to the job
No, it is not, your premise is false (in our real world. TM.) but your reasoning is good.
Energy does not vanish, you need a process to remove energy of a system.
Think in the planets orbiting the sun or the energy contained in a damm with millions liters of water. The energy is not dissipating itself, it is constant, forever.
So as long as the system is not disturbed, keeping the system in the same state is energy free because you only need energy to alter the system. Even of the energy distributions is not evenly balanced through it.
Disclaimer about the real world