My name is John Kuehnl-Cadwell and I am a master Electrician and own a Licensed Electrical Contracting (LEC) company in Ontario Canada.
I have considered similar approaches over my many years in business and depending on what vertical you are in this could be lucrative. In industrial this is a mainstay for the LEC. While a plat may have its own maintenance electricians, they often cannot get bogged down in major maintenance because they need to keep the plant running. In commercial this is more about thing like parking lot lighting, electric doors, emergency lighting, etc. In residential the only thing I have had success in is AL wiring and generators.
In your post it seems like you are focusing on the residential market; I have tried the exterior GFCI maintenance prior to Xmas and in the spring… no response, have tried the annual smoke detector maintenance in November, no response.
Now in Canada (particularly in Ontario), our electrical codes are pretty robust, so there really is not a lot of stresses on the electrical system or individual items such as breaker, panels, devices, etc. for the exception of AL wiring, which there is still plenty of it out there.
One success we do have is with our property maintenance companies, we offer a program to do a complete inspection and swap out of devices and panel marking when a unit becomes empty. The problem at the moment, because of the super low vacancy rate no one is moving anywhere LOL!
Cheers
John