It is in demand by military installations and public organizations that value closed networks and security. In fact, I'm running a company that will be installing a local LLM on-premise in 2024, and we're currently working on a B2G contract.
I don't think it's worth it for personal use, and the reason is simple. There are already a lot of tools that can write local LLMs, so I don't think I'd be able to get users to pay for just using the model, I'd have to provide functionality, like automating certain behaviors.